Issue #1705 - Part 3: Rename ScrollbarStyles to ScrollStyles.

ScrollbarStyles contains values of overflow, (over)scroll-behavior, etc.
The only one which is marginally related to scroll _bars_ is overflow, which can
be used to hide scrollbar (by making an element not scrollable) or enforce the
scrollbar to display.

It makes more sense to be called ScrollStyles as it's mainly concerning behavior
of scrolling, not scrollbars. Also, with the addition of scrollbar width
properties, the current name can be confusing.

26 files changed, 111 insertions, 111 deletions

diff --git a/accessible/tests/mochitest/treeupdate/test_cssoverflow.html b/accessible/tests/mochitest/treeupdate/test_cssoverflow.html
index ed9edd66e..911299af0 100644
--- a/accessible/tests/mochitest/treeupdate/test_cssoverflow.html
+++ b/accessible/tests/mochitest/treeupdate/test_cssoverflow.html
@@ -67,7 +67,7 @@
      * Change scrollbar styles from hidden to auto. That makes us to create an
      * accessible for scroll area.
      */
-    function changeScrollbarStyles(aContainerID, aScrollAreaID)
+    function changeScrollStyles(aContainerID, aScrollAreaID)
     {
       this.container = getAccessible(aContainerID);
       this.scrollAreaNode = getNode(aScrollAreaID);
@@ -77,7 +77,7 @@
         new invokerChecker(EVENT_REORDER, this.container)
       ];
 
-      this.invoke = function changeScrollbarStyles_invoke()
+      this.invoke = function changeScrollStyles_invoke()
       {
         var accTree =
           { SECTION: [] };
@@ -86,7 +86,7 @@
         this.scrollAreaNode.style.overflow = "auto";
       }
 
-      this.finalCheck = function changeScrollbarStyles_finalCheck()
+      this.finalCheck = function changeScrollStyles_finalCheck()
       {
         var accTree =
           { SECTION: [ // container
@@ -95,7 +95,7 @@
         testAccessibleTree(this.container, accTree);
       }
 
-      this.getID = function changeScrollbarStyles_getID()
+      this.getID = function changeScrollStyles_getID()
       {
         return "change scrollbar styles " + prettyName(aScrollAreaID);
       }
@@ -114,7 +114,7 @@
       gQueue = new eventQueue();
 
       gQueue.push(new changeScrollRange("container", "scrollarea"));
-      gQueue.push(new changeScrollbarStyles("container2", "scrollarea2"));
+      gQueue.push(new changeScrollStyles("container2", "scrollarea2"));
 
       gQueue.invoke(); // Will call SimpleTest.finish();
     }
diff --git a/dom/animation/KeyframeEffectReadOnly.cpp b/dom/animation/KeyframeEffectReadOnly.cpp
index 179ed6cb4..2efc747f0 100644
--- a/dom/animation/KeyframeEffectReadOnly.cpp
+++ b/dom/animation/KeyframeEffectReadOnly.cpp
@@ -1089,7 +1089,7 @@ KeyframeEffectReadOnly::CanThrottleTransformChanges(nsIFrame& aFrame) const
     return true;
   }
 
-  ScrollbarStyles ss = scrollable->GetScrollbarStyles();
+  ScrollStyles ss = scrollable->GetScrollStyles();
   if (ss.mVertical == NS_STYLE_OVERFLOW_HIDDEN &&
       ss.mHorizontal == NS_STYLE_OVERFLOW_HIDDEN &&
       scrollable->GetLogicalScrollPosition() == nsPoint(0, 0)) {
diff --git a/dom/base/Element.cpp b/dom/base/Element.cpp
index 940045ca7..9ba065238 100644
--- a/dom/base/Element.cpp
+++ b/dom/base/Element.cpp
@@ -745,7 +745,7 @@ Element::Scroll(const CSSIntPoint& aScroll, const ScrollOptions& aOptions)
     if (aOptions.mBehavior == ScrollBehavior::Smooth) {
       scrollMode = nsIScrollableFrame::SMOOTH_MSD;
     } else if (aOptions.mBehavior == ScrollBehavior::Auto) {
-      ScrollbarStyles styles = sf->GetScrollbarStyles();
+      ScrollStyles styles = sf->GetScrollStyles();
       if (styles.mScrollBehavior == NS_STYLE_SCROLL_BEHAVIOR_SMOOTH) {
         scrollMode = nsIScrollableFrame::SMOOTH_MSD;
       }
@@ -834,7 +834,7 @@ Element::SetScrollTop(int32_t aScrollTop)
   nsIScrollableFrame* sf = GetScrollFrame();
   if (sf) {
     nsIScrollableFrame::ScrollMode scrollMode = nsIScrollableFrame::INSTANT;
-    if (sf->GetScrollbarStyles().mScrollBehavior == NS_STYLE_SCROLL_BEHAVIOR_SMOOTH) {
+    if (sf->GetScrollStyles().mScrollBehavior == NS_STYLE_SCROLL_BEHAVIOR_SMOOTH) {
       scrollMode = nsIScrollableFrame::SMOOTH_MSD;
     }
     sf->ScrollToCSSPixels(CSSIntPoint(sf->GetScrollPositionCSSPixels().x,
@@ -856,7 +856,7 @@ Element::SetScrollLeft(int32_t aScrollLeft)
   nsIScrollableFrame* sf = GetScrollFrame();
   if (sf) {
     nsIScrollableFrame::ScrollMode scrollMode = nsIScrollableFrame::INSTANT;
-    if (sf->GetScrollbarStyles().mScrollBehavior == NS_STYLE_SCROLL_BEHAVIOR_SMOOTH) {
+    if (sf->GetScrollStyles().mScrollBehavior == NS_STYLE_SCROLL_BEHAVIOR_SMOOTH) {
       scrollMode = nsIScrollableFrame::SMOOTH_MSD;
     }
 
@@ -1069,7 +1069,7 @@ ShadowRoot*
 Element::GetShadowRootByMode() const
 {
   /**
-   * 1. Let shadow be context object’s shadow root.
+   * 1. Let shadow be context object???s shadow root.
    * 2. If shadow is null or its mode is "closed", then return null.
    */
   ShadowRoot* shadowRoot = GetShadowRoot();
@@ -1088,7 +1088,7 @@ already_AddRefed<ShadowRoot>
 Element::AttachShadow(const ShadowRootInit& aInit, ErrorResult& aError)
 {
   /**
-   * 1. If context object’s namespace is not the HTML namespace,
+   * 1. If context object???s namespace is not the HTML namespace,
    *    then throw a "NotSupportedError" DOMException.
    */
   if (!IsHTMLElement()) {
@@ -1097,7 +1097,7 @@ Element::AttachShadow(const ShadowRootInit& aInit, ErrorResult& aError)
   }
 
   /**
-   * 2. If context object’s local name is not
+   * 2. If context object???s local name is not
    *      a valid custom element name, "article", "aside", "blockquote",
    *      "body", "div", "footer", "h1", "h2", "h3", "h4", "h5", "h6",
    *      "header", "main" "nav", "p", "section", or "span",
@@ -1181,8 +1181,8 @@ Element::AttachShadowInternal(bool aClosed, ErrorResult& aError)
 
   /**
    * 4. Let shadow be a new shadow root whose node document is
-   *    context object’s node document, host is context object,
-   *    and mode is init’s mode.
+   *    context object???s node document, host is context object,
+   *    and mode is init???s mode.
    */
   RefPtr<ShadowRoot> shadowRoot =
     new ShadowRoot(this, aClosed, nodeInfo.forget(), protoBinding);
@@ -1190,7 +1190,7 @@ Element::AttachShadowInternal(bool aClosed, ErrorResult& aError)
   shadowRoot->SetIsComposedDocParticipant(IsInComposedDoc());
 
   /**
-   * 5. Set context object’s shadow root to shadow.
+   * 5. Set context object???s shadow root to shadow.
    */
   SetShadowRoot(shadowRoot);
 
@@ -1890,7 +1890,7 @@ Element::UnbindFromTree(bool aDeep, bool aNullParent)
       nsPresContext* presContext = presShell->GetPresContext();
       if (presContext) {
         MOZ_ASSERT(this !=
-                   presContext->GetViewportScrollbarStylesOverrideNode(),
+                   presContext->GetViewportScrollStylesOverrideNode(),
                    "Leaving behind a raw pointer to this node (as having "
                    "propagated scrollbar styles) - that's dangerous...");
       }
diff --git a/dom/base/nsDocument.cpp b/dom/base/nsDocument.cpp
index 0396848a9..0fed2db01 100644
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -10568,7 +10568,7 @@ UpdateViewportScrollbarOverrideForFullscreen(nsIDocument* aDoc)
 {
   if (nsIPresShell* presShell = aDoc->GetShell()) {
     if (nsPresContext* presContext = presShell->GetPresContext()) {
-      presContext->UpdateViewportScrollbarStylesOverride();
+      presContext->UpdateViewportScrollStylesOverride();
     }
   }
 }
diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 4e80568f6..38a58f947 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -8264,7 +8264,7 @@ nsGlobalWindow::ScrollTo(const CSSIntPoint& aScroll,
       scroll.y = maxpx;
     }
 
-    bool smoothScroll = sf->GetScrollbarStyles().IsSmoothScroll(aOptions.mBehavior);
+    bool smoothScroll = sf->GetScrollStyles().IsSmoothScroll(aOptions.mBehavior);
 
     sf->ScrollToCSSPixels(scroll, smoothScroll
                             ? nsIScrollableFrame::SMOOTH_MSD
@@ -8320,7 +8320,7 @@ nsGlobalWindow::ScrollByLines(int32_t numLines,
     // It seems like it would make more sense for ScrollByLines to use
     // SMOOTH mode, but tests seem to depend on the synchronous behaviour.
     // Perhaps Web content does too.
-    bool smoothScroll = sf->GetScrollbarStyles().IsSmoothScroll(aOptions.mBehavior);
+    bool smoothScroll = sf->GetScrollStyles().IsSmoothScroll(aOptions.mBehavior);
 
     sf->ScrollBy(nsIntPoint(0, numLines), nsIScrollableFrame::LINES,
                  smoothScroll
@@ -8341,7 +8341,7 @@ nsGlobalWindow::ScrollByPages(int32_t numPages,
     // It seems like it would make more sense for ScrollByPages to use
     // SMOOTH mode, but tests seem to depend on the synchronous behaviour.
     // Perhaps Web content does too.
-    bool smoothScroll = sf->GetScrollbarStyles().IsSmoothScroll(aOptions.mBehavior);
+    bool smoothScroll = sf->GetScrollStyles().IsSmoothScroll(aOptions.mBehavior);
 
     sf->ScrollBy(nsIntPoint(0, numPages), nsIScrollableFrame::PAGES,
                  smoothScroll
diff --git a/dom/events/EventStateManager.cpp b/dom/events/EventStateManager.cpp
index 2ca698024..c8f1acdb5 100644
--- a/dom/events/EventStateManager.cpp
+++ b/dom/events/EventStateManager.cpp
@@ -2516,7 +2516,7 @@ EventStateManager::ComputeScrollTarget(nsIFrame* aTargetFrame,
       return frameToScroll;
     }
 
-    ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
+    ScrollStyles ss = scrollableFrame->GetScrollStyles();
     bool hiddenForV = (NS_STYLE_OVERFLOW_HIDDEN == ss.mVertical);
     bool hiddenForH = (NS_STYLE_OVERFLOW_HIDDEN == ss.mHorizontal);
     if ((hiddenForV && hiddenForH) ||
@@ -2609,7 +2609,7 @@ EventStateManager::DoScrollText(nsIScrollableFrame* aScrollableFrame,
       ComputeScrollAmountForDefaultAction(aEvent, scrollAmountInDevPixels);
 
   // Don't scroll around the axis whose overflow style is hidden.
-  ScrollbarStyles overflowStyle = aScrollableFrame->GetScrollbarStyles();
+  ScrollStyles overflowStyle = aScrollableFrame->GetScrollStyles();
   if (overflowStyle.mHorizontal == NS_STYLE_OVERFLOW_HIDDEN) {
     actualDevPixelScrollAmount.x = 0;
   }
diff --git a/gfx/layers/apz/util/APZCCallbackHelper.cpp b/gfx/layers/apz/util/APZCCallbackHelper.cpp
index 2fda14719..e1d4cdf54 100644
--- a/gfx/layers/apz/util/APZCCallbackHelper.cpp
+++ b/gfx/layers/apz/util/APZCCallbackHelper.cpp
@@ -92,10 +92,10 @@ ScrollFrameTo(nsIScrollableFrame* aFrame, const FrameMetrics& aMetrics, bool& aS
   // (by design). Note also that when we run into this case, even if both axes
   // have overflow:hidden, we want to set aSuccessOut to true, so that the displayport
   // follows the async scroll position rather than the gecko scroll position.
-  if (aFrame->GetScrollbarStyles().mVertical == NS_STYLE_OVERFLOW_HIDDEN) {
+  if (aFrame->GetScrollStyles().mVertical == NS_STYLE_OVERFLOW_HIDDEN) {
     targetScrollPosition.y = geckoScrollPosition.y;
   }
-  if (aFrame->GetScrollbarStyles().mHorizontal == NS_STYLE_OVERFLOW_HIDDEN) {
+  if (aFrame->GetScrollStyles().mHorizontal == NS_STYLE_OVERFLOW_HIDDEN) {
     targetScrollPosition.x = geckoScrollPosition.x;
   }
 
diff --git a/layout/base/RestyleManagerBase.cpp b/layout/base/RestyleManagerBase.cpp
index 433589dac..192c0df99 100644
--- a/layout/base/RestyleManagerBase.cpp
+++ b/layout/base/RestyleManagerBase.cpp
@@ -1137,9 +1137,9 @@ if (!mDestroyedFrames) {
         // to reconstruct - we can just reflow, because no scrollframe is being
         // added/removed.
         nsIContent* prevOverrideNode =
-          presContext->GetViewportScrollbarStylesOverrideNode();
+          presContext->GetViewportScrollStylesOverrideNode();
         nsIContent* newOverrideNode =
-          presContext->UpdateViewportScrollbarStylesOverride();
+          presContext->UpdateViewportScrollStylesOverride();
 
         if (data.mContent == prevOverrideNode ||
             data.mContent == newOverrideNode) {
diff --git a/layout/base/ScrollbarStyles.cpp b/layout/base/ScrollStyles.cpp
index cc9f0c57d..328657d3d 100644
--- a/layout/base/ScrollbarStyles.cpp
+++ b/layout/base/ScrollStyles.cpp
@@ -3,12 +3,12 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#include "ScrollbarStyles.h"
+#include "ScrollStyles.h"
 #include "nsStyleStruct.h" // for nsStyleDisplay and nsStyleBackground::Position
 
 namespace mozilla {
 
-  ScrollbarStyles::ScrollbarStyles(uint8_t aH, uint8_t aV,
+  ScrollStyles::ScrollStyles(uint8_t aH, uint8_t aV,
                                    const nsStyleDisplay* aDisplay)
     : mHorizontal(aH), mVertical(aV),
       mScrollBehavior(aDisplay->mScrollBehavior),
@@ -19,7 +19,7 @@ namespace mozilla {
       mScrollSnapDestinationX(aDisplay->mScrollSnapDestination.mXPosition),
       mScrollSnapDestinationY(aDisplay->mScrollSnapDestination.mYPosition) {}
 
-  ScrollbarStyles::ScrollbarStyles(const nsStyleDisplay* aDisplay)
+  ScrollStyles::ScrollStyles(const nsStyleDisplay* aDisplay)
     : mHorizontal(aDisplay->mOverflowX), mVertical(aDisplay->mOverflowY),
       mScrollBehavior(aDisplay->mScrollBehavior),
       mScrollSnapTypeX(aDisplay->mScrollSnapTypeX),
diff --git a/layout/base/ScrollbarStyles.h b/layout/base/ScrollStyles.h
index e6f0c6dde..c5743ee6b 100644
--- a/layout/base/ScrollbarStyles.h
+++ b/layout/base/ScrollStyles.h
@@ -3,8 +3,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#ifndef ScrollbarStyles_h
-#define ScrollbarStyles_h
+#ifndef ScrollStyles_h
+#define ScrollStyles_h
 
 #include <stdint.h>
 #include "nsStyleConsts.h" // for NS_STYLE_SCROLL_SNAP_*
@@ -16,7 +16,7 @@ struct nsStyleDisplay;
 
 namespace mozilla {
 
-struct ScrollbarStyles
+struct ScrollStyles
 {
   // Always one of NS_STYLE_OVERFLOW_SCROLL, NS_STYLE_OVERFLOW_HIDDEN,
   // or NS_STYLE_OVERFLOW_AUTO.
@@ -34,7 +34,7 @@ struct ScrollbarStyles
   nsStyleCoord::CalcValue mScrollSnapDestinationX;
   nsStyleCoord::CalcValue mScrollSnapDestinationY;
 
-  ScrollbarStyles(uint8_t aH, uint8_t aV)
+  ScrollStyles(uint8_t aH, uint8_t aV)
     : mHorizontal(aH), mVertical(aV),
       mScrollBehavior(NS_STYLE_SCROLL_BEHAVIOR_AUTO),
       mScrollSnapTypeX(NS_STYLE_SCROLL_SNAP_TYPE_NONE),
@@ -50,10 +50,10 @@ struct ScrollbarStyles
     mScrollSnapDestinationY.mHasPercent = false;
   }
 
-  explicit ScrollbarStyles(const nsStyleDisplay* aDisplay);
-  ScrollbarStyles(uint8_t aH, uint8_t aV, const nsStyleDisplay* aDisplay);
-  ScrollbarStyles() {}
-  bool operator==(const ScrollbarStyles& aStyles) const {
+  explicit ScrollStyles(const nsStyleDisplay* aDisplay);
+  ScrollStyles(uint8_t aH, uint8_t aV, const nsStyleDisplay* aDisplay);
+  ScrollStyles() {}
+  bool operator==(const ScrollStyles& aStyles) const {
     return aStyles.mHorizontal == mHorizontal && aStyles.mVertical == mVertical &&
            aStyles.mScrollBehavior == mScrollBehavior &&
            aStyles.mScrollSnapTypeX == mScrollSnapTypeX &&
@@ -63,7 +63,7 @@ struct ScrollbarStyles
            aStyles.mScrollSnapDestinationX == mScrollSnapDestinationX &&
            aStyles.mScrollSnapDestinationY == mScrollSnapDestinationY;
   }
-  bool operator!=(const ScrollbarStyles& aStyles) const {
+  bool operator!=(const ScrollStyles& aStyles) const {
     return !(*this == aStyles);
   }
   bool IsHiddenInBothDirections() const {
diff --git a/layout/base/moz.build b/layout/base/moz.build
index 51cab4c6b..86377e9db 100644
--- a/layout/base/moz.build
+++ b/layout/base/moz.build
@@ -95,7 +95,7 @@ EXPORTS += [
     'nsRefreshDriver.h',
     'nsStyleChangeList.h',
     'nsStyleSheetService.h',
-    'ScrollbarStyles.h',
+    'ScrollStyles.h',
     'StackArena.h',
     'Units.h',
     'UnitTransforms.h',
@@ -162,7 +162,7 @@ SOURCES += [
     'RestyleManager.cpp',
     'RestyleManagerBase.cpp',
     'RestyleTracker.cpp',
-    'ScrollbarStyles.cpp',
+    'ScrollStyles.cpp',
     'ServoRestyleManager.cpp',
     'StackArena.cpp',
     'StaticPresData.cpp',
diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index 45b95826c..2cc5ec818 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -2406,12 +2406,12 @@ nsCSSFrameConstructor::ConstructDocElementFrame(Element*                 aDocEle
     GetRootFrame()->SetStyleContextWithoutNotification(sc);
   }
 
-  // Make sure to call UpdateViewportScrollbarStylesOverride before
+  // Make sure to call UpdateViewportScrollStylesOverride before
   // SetUpDocElementContainingBlock, since it sets up our scrollbar state
   // properly.
   DebugOnly<nsIContent*> propagatedScrollFrom;
   if (nsPresContext* presContext = mPresShell->GetPresContext()) {
-    propagatedScrollFrom = presContext->UpdateViewportScrollbarStylesOverride();
+    propagatedScrollFrom = presContext->UpdateViewportScrollStylesOverride();
   }
 
   SetUpDocElementContainingBlock(aDocElement);
@@ -4660,7 +4660,7 @@ nsCSSFrameConstructor::FindDisplayData(const nsStyleDisplay* aDisplay,
   if (aElement->IsHTMLElement(nsGkAtoms::body)) {
     if (nsPresContext* presContext = mPresShell->GetPresContext()) {
       propagatedScrollToViewport =
-        presContext->UpdateViewportScrollbarStylesOverride() == aElement;
+        presContext->UpdateViewportScrollStylesOverride() == aElement;
     }
   }
 
@@ -4696,7 +4696,7 @@ nsCSSFrameConstructor::FindDisplayData(const nsStyleDisplay* aDisplay,
       // scrollframe so that it paginates correctly, but we don't want to set
       // the bit on the block that tells it to clip at paint time.
       if (mPresShell->GetPresContext()->
-            ElementWouldPropagateScrollbarStyles(aElement)) {
+            ElementWouldPropagateScrollStyles(aElement)) {
         suppressScrollFrame = false;
       }
     }
@@ -8133,7 +8133,7 @@ nsCSSFrameConstructor::ContentRemoved(nsIContent* aContainer,
     // source is a fullscreen element, and we have code elsewhere to update
     // scrollbars after fullscreen elements are removed -- specifically, it's
     // part of the fullscreen cleanup code called by Element::UnbindFromTree.)
-    presContext->UpdateViewportScrollbarStylesOverride();
+    presContext->UpdateViewportScrollStylesOverride();
   }
 
   // XXXldb Do we need to re-resolve style to handle the CSS2 + combinator and
diff --git a/layout/base/nsCSSFrameConstructor.h b/layout/base/nsCSSFrameConstructor.h
index 0de00a90c..abdfbf7ce 100644
--- a/layout/base/nsCSSFrameConstructor.h
+++ b/layout/base/nsCSSFrameConstructor.h
@@ -22,7 +22,7 @@
 #include "nsCounterManager.h"
 #include "nsIAnonymousContentCreator.h"
 #include "nsFrameManager.h"
-#include "ScrollbarStyles.h"
+#include "ScrollStyles.h"
 
 struct nsFrameItems;
 class nsStyleContext;
diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
index 86a11bce9..ccdc5503f 100644
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -2023,7 +2023,7 @@ nsLayoutUtils::GetNearestScrollableFrameForDirection(nsIFrame* aFrame,
   for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
     nsIScrollableFrame* scrollableFrame = do_QueryFrame(f);
     if (scrollableFrame) {
-      ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
+      ScrollStyles ss = scrollableFrame->GetScrollStyles();
       uint32_t directions = scrollableFrame->GetPerceivedScrollingDirections();
       if (aDirection == eVertical ?
           (ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN &&
@@ -2050,7 +2050,7 @@ nsLayoutUtils::GetNearestScrollableFrame(nsIFrame* aFrame, uint32_t aFlags)
           return scrollableFrame;
         }
       } else {
-        ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
+        ScrollStyles ss = scrollableFrame->GetScrollStyles();
         if ((aFlags & SCROLLABLE_INCLUDE_HIDDEN) ||
             ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN ||
             ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN) {
@@ -8255,11 +8255,11 @@ nsLayoutUtils::CalculateScrollableRectForFrame(nsIScrollableFrame* aScrollableFr
     contentBounds = aScrollableFrame->GetScrollRange();
 
     nsPoint scrollPosition = aScrollableFrame->GetScrollPosition();
-    if (aScrollableFrame->GetScrollbarStyles().mVertical == NS_STYLE_OVERFLOW_HIDDEN) {
+    if (aScrollableFrame->GetScrollStyles().mVertical == NS_STYLE_OVERFLOW_HIDDEN) {
       contentBounds.y = scrollPosition.y;
       contentBounds.height = 0;
     }
-    if (aScrollableFrame->GetScrollbarStyles().mHorizontal == NS_STYLE_OVERFLOW_HIDDEN) {
+    if (aScrollableFrame->GetScrollStyles().mHorizontal == NS_STYLE_OVERFLOW_HIDDEN) {
       contentBounds.x = scrollPosition.x;
       contentBounds.width = 0;
     }
diff --git a/layout/base/nsPresContext.cpp b/layout/base/nsPresContext.cpp
index 1d90b967a..f7be42b5f 100644
--- a/layout/base/nsPresContext.cpp
+++ b/layout/base/nsPresContext.cpp
@@ -1346,7 +1346,7 @@ nsPresContext::ScreenSizeInchesForFontInflation(bool* aChanged)
 }
 
 static bool
-CheckOverflow(const nsStyleDisplay* aDisplay, ScrollbarStyles* aStyles)
+CheckOverflow(const nsStyleDisplay* aDisplay, ScrollStyles* aStyles)
 {
   if (aDisplay->mOverflowX == NS_STYLE_OVERFLOW_VISIBLE &&
       aDisplay->mScrollBehavior == NS_STYLE_SCROLL_BEHAVIOR_AUTO &&
@@ -1362,17 +1362,17 @@ CheckOverflow(const nsStyleDisplay* aDisplay, ScrollbarStyles* aStyles)
   }
 
   if (aDisplay->mOverflowX == NS_STYLE_OVERFLOW_CLIP) {
-    *aStyles = ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN,
+    *aStyles = ScrollStyles(NS_STYLE_OVERFLOW_HIDDEN,
                                NS_STYLE_OVERFLOW_HIDDEN, aDisplay);
   } else {
-    *aStyles = ScrollbarStyles(aDisplay);
+    *aStyles = ScrollStyles(aDisplay);
   }
   return true;
 }
 
 static nsIContent*
-GetPropagatedScrollbarStylesForViewport(nsPresContext* aPresContext,
-                                        ScrollbarStyles *aStyles)
+GetPropagatedScrollStylesForViewport(nsPresContext* aPresContext,
+                                     ScrollStyles *aStyles)
 {
   nsIDocument* document = aPresContext->Document();
   Element* docElement = document->GetRootElement();
@@ -1424,16 +1424,16 @@ GetPropagatedScrollbarStylesForViewport(nsPresContext* aPresContext,
 }
 
 nsIContent*
-nsPresContext::UpdateViewportScrollbarStylesOverride()
+nsPresContext::UpdateViewportScrollStylesOverride()
 {
   // Start off with our default styles, and then update them as needed.
-  mViewportStyleScrollbar = ScrollbarStyles(NS_STYLE_OVERFLOW_AUTO,
+  mViewportStyleScrollbar = ScrollStyles(NS_STYLE_OVERFLOW_AUTO,
                                             NS_STYLE_OVERFLOW_AUTO);
   mViewportScrollbarOverrideNode = nullptr;
   // Don't propagate the scrollbar state in printing or print preview.
   if (!IsPaginated()) {
     mViewportScrollbarOverrideNode =
-      GetPropagatedScrollbarStylesForViewport(this, &mViewportStyleScrollbar);
+      GetPropagatedScrollStylesForViewport(this, &mViewportStyleScrollbar);
   }
 
   nsIDocument* document = Document();
@@ -1445,7 +1445,7 @@ nsPresContext::UpdateViewportScrollbarStylesOverride()
     // affected across fullscreen change.
     if (fullscreenElement != document->GetRootElement() &&
         fullscreenElement != mViewportScrollbarOverrideNode) {
-      mViewportStyleScrollbar = ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN,
+      mViewportStyleScrollbar = ScrollStyles(NS_STYLE_OVERFLOW_HIDDEN,
                                                 NS_STYLE_OVERFLOW_HIDDEN);
     }
   }
@@ -1454,7 +1454,7 @@ nsPresContext::UpdateViewportScrollbarStylesOverride()
 }
 
 bool
-nsPresContext::ElementWouldPropagateScrollbarStyles(Element* aElement)
+nsPresContext::ElementWouldPropagateScrollStyles(Element* aElement)
 {
   MOZ_ASSERT(IsPaginated(), "Should only be called on paginated contexts");
   if (aElement->GetParent() && !aElement->IsHTMLElement(nsGkAtoms::body)) {
@@ -1462,13 +1462,13 @@ nsPresContext::ElementWouldPropagateScrollbarStyles(Element* aElement)
     return false;
   }
 
-  // Go ahead and just call GetPropagatedScrollbarStylesForViewport, but update
-  // a dummy ScrollbarStyles we don't care about.  It'll do a bit of extra work,
+  // Go ahead and just call GetPropagatedScrollStylesForViewport, but update
+  // a dummy ScrollStyles we don't care about.  It'll do a bit of extra work,
   // but saves us having to have more complicated code or more code duplication;
   // in practice we will make this call quite rarely, because we checked for all
   // the common cases above.
-  ScrollbarStyles dummy(NS_STYLE_OVERFLOW_AUTO, NS_STYLE_OVERFLOW_AUTO);
-  return GetPropagatedScrollbarStylesForViewport(this, &dummy) == aElement;
+  ScrollStyles dummy(NS_STYLE_OVERFLOW_AUTO, NS_STYLE_OVERFLOW_AUTO);
+  return GetPropagatedScrollStylesForViewport(this, &dummy) == aElement;
 }
 
 void
diff --git a/layout/base/nsPresContext.h b/layout/base/nsPresContext.h
index a2b9bb533..10908a604 100644
--- a/layout/base/nsPresContext.h
+++ b/layout/base/nsPresContext.h
@@ -35,7 +35,7 @@
 #include "mozilla/AppUnits.h"
 #include "prclist.h"
 #include "nsThreadUtils.h"
-#include "ScrollbarStyles.h"
+#include "ScrollStyles.h"
 #include "nsIMessageManager.h"
 #include "mozilla/RestyleLogging.h"
 #include "Units.h"
@@ -140,7 +140,7 @@ class nsPresContext : public nsIObserver,
                       public mozilla::SupportsWeakPtr<nsPresContext> {
 public:
   typedef mozilla::LangGroupFontPrefs LangGroupFontPrefs;
-  typedef mozilla::ScrollbarStyles ScrollbarStyles;
+  typedef mozilla::ScrollStyles ScrollStyles;
   typedef mozilla::StaticPresData StaticPresData;
 
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
@@ -716,19 +716,19 @@ public:
    * @return if scroll was propagated from some content node, the content node
    *         it was propagated from.
    */
-  nsIContent* UpdateViewportScrollbarStylesOverride();
+  nsIContent* UpdateViewportScrollStylesOverride();
 
   /**
    * Returns the cached result from the last call to
-   * UpdateViewportScrollbarStylesOverride() -- i.e. return the node
+   * UpdateViewportScrollStylesOverride() -- i.e. return the node
    * whose scrollbar styles we have propagated to the viewport (or nullptr if
    * there is no such node).
    */
-  nsIContent* GetViewportScrollbarStylesOverrideNode() const {
+  nsIContent* GetViewportScrollStylesOverrideNode() const {
     return mViewportScrollbarOverrideNode;
   }
 
-  const ScrollbarStyles& GetViewportScrollbarStylesOverride() const
+  const ScrollStyles& GetViewportScrollStylesOverride() const
   {
     return mViewportStyleScrollbar;
   }
@@ -737,7 +737,7 @@ public:
    * Check whether the given element would propagate its scrollbar styles to the
    * viewport in non-paginated mode.  Must only be called if IsPaginated().
    */
-  bool ElementWouldPropagateScrollbarStyles(mozilla::dom::Element* aElement);
+  bool ElementWouldPropagateScrollStyles(mozilla::dom::Element* aElement);
 
   /**
    * Set and get methods for controlling the background drawing
@@ -1312,13 +1312,13 @@ protected:
 
   // This is a non-owning pointer. May be null. If non-null, it's guaranteed
   // to be pointing to a node that's still alive, because we'll reset it in
-  // UpdateViewportScrollbarStylesOverride() as part of the cleanup code
+  // UpdateViewportScrollStylesOverride() as part of the cleanup code
   // when this node is removed from the document. (For <body> and the root node,
   // this call happens in nsCSSFrameConstructor::ContentRemoved(). For
   // fullscreen elements, it happens in the fullscreen-specific cleanup
   // invoked by Element::UnbindFromTree().)
   nsIContent* MOZ_NON_OWNING_REF mViewportScrollbarOverrideNode;
-  ScrollbarStyles       mViewportStyleScrollbar;
+  ScrollStyles          mViewportStyleScrollbar;
 
   uint8_t               mFocusRingWidth;
 
diff --git a/layout/base/nsPresShell.cpp b/layout/base/nsPresShell.cpp
index 1fb223172..9ba4ff462 100644
--- a/layout/base/nsPresShell.cpp
+++ b/layout/base/nsPresShell.cpp
@@ -3331,7 +3331,7 @@ static void ScrollToShowRect(nsIScrollableFrame*      aFrameAsScrollable,
       aHorizontal.mWhenToScroll == nsIPresShell::SCROLL_IF_NOT_VISIBLE) {
     lineSize = aFrameAsScrollable->GetLineScrollAmount();
   }
-  ScrollbarStyles ss = aFrameAsScrollable->GetScrollbarStyles();
+  ScrollStyles ss = aFrameAsScrollable->GetScrollStyles();
   nsRect allowedRange(scrollPt, nsSize(0, 0));
   bool needToScroll = false;
   uint32_t directions = aFrameAsScrollable->GetPerceivedScrollingDirections();
@@ -3388,7 +3388,7 @@ static void ScrollToShowRect(nsIScrollableFrame*      aFrameAsScrollable,
   // a current smooth scroll operation.
   if (needToScroll) {
     nsIScrollableFrame::ScrollMode scrollMode = nsIScrollableFrame::INSTANT;
-    bool autoBehaviorIsSmooth = (aFrameAsScrollable->GetScrollbarStyles().mScrollBehavior
+    bool autoBehaviorIsSmooth = (aFrameAsScrollable->GetScrollStyles().mScrollBehavior
                                   == NS_STYLE_SCROLL_BEHAVIOR_SMOOTH);
     bool smoothScroll = (aFlags & nsIPresShell::SCROLL_SMOOTH) ||
                           ((aFlags & nsIPresShell::SCROLL_SMOOTH_AUTO) && autoBehaviorIsSmooth);
diff --git a/layout/forms/nsListControlFrame.cpp b/layout/forms/nsListControlFrame.cpp
index 7bd356a22..4daa470a9 100644
--- a/layout/forms/nsListControlFrame.cpp
+++ b/layout/forms/nsListControlFrame.cpp
@@ -614,17 +614,17 @@ nsListControlFrame::ReflowAsDropdown(nsPresContext*           aPresContext,
   nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
 }
 
-ScrollbarStyles
-nsListControlFrame::GetScrollbarStyles() const
+ScrollStyles
+nsListControlFrame::GetScrollStyles() const
 {
   // We can't express this in the style system yet; when we can, this can go away
-  // and GetScrollbarStyles can be devirtualized
+  // and GetScrollStyles can be devirtualized
   int32_t style = IsInDropDownMode() ? NS_STYLE_OVERFLOW_AUTO
                                      : NS_STYLE_OVERFLOW_SCROLL;
   if (GetWritingMode().IsVertical()) {
-    return ScrollbarStyles(style, NS_STYLE_OVERFLOW_HIDDEN);
+    return ScrollStyles(style, NS_STYLE_OVERFLOW_HIDDEN);
   } else {
-    return ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN, style);
+    return ScrollStyles(NS_STYLE_OVERFLOW_HIDDEN, style);
   }
 }
 
diff --git a/layout/forms/nsListControlFrame.h b/layout/forms/nsListControlFrame.h
index d8df9ebd6..fa939d6c8 100644
--- a/layout/forms/nsListControlFrame.h
+++ b/layout/forms/nsListControlFrame.h
@@ -106,7 +106,7 @@ public:
   virtual nsresult SetFormProperty(nsIAtom* aName, const nsAString& aValue) override;
   virtual void SetFocus(bool aOn = true, bool aRepaint = false) override;
 
-  virtual mozilla::ScrollbarStyles GetScrollbarStyles() const override;
+  virtual mozilla::ScrollStyles GetScrollStyles() const override;
   virtual bool ShouldPropagateComputedBSizeToScrolledContent() const override;
 
     // for accessibility purposes
diff --git a/layout/generic/TextOverflow.cpp b/layout/generic/TextOverflow.cpp
index f4db27766..3d78eaf91 100644
--- a/layout/generic/TextOverflow.cpp
+++ b/layout/generic/TextOverflow.cpp
@@ -305,8 +305,8 @@ TextOverflow::TextOverflow(nsDisplayListBuilder* aBuilder,
   mCanHaveInlineAxisScrollbar = false;
   if (mScrollableFrame) {
     auto scrollbarStyle = mBlockWM.IsVertical() ?
-      mScrollableFrame->GetScrollbarStyles().mVertical :
-      mScrollableFrame->GetScrollbarStyles().mHorizontal;
+      mScrollableFrame->GetScrollStyles().mVertical :
+      mScrollableFrame->GetScrollStyles().mHorizontal;
     mCanHaveInlineAxisScrollbar = scrollbarStyle != NS_STYLE_OVERFLOW_HIDDEN;
     if (!mAdjustForPixelSnapping) {
       // Scrolling to the end position can leave some text still overflowing due
diff --git a/layout/generic/nsFrame.cpp b/layout/generic/nsFrame.cpp
index a9e6354ab..5d05b7103 100644
--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -9188,7 +9188,7 @@ nsIFrame::IsFocusable(int32_t *aTabIndex, bool aWithMouse)
       // will be enough to make them keyboard scrollable.
       nsIScrollableFrame *scrollFrame = do_QueryFrame(this);
       if (scrollFrame &&
-          !scrollFrame->GetScrollbarStyles().IsHiddenInBothDirections() &&
+          !scrollFrame->GetScrollStyles().IsHiddenInBothDirections() &&
           !scrollFrame->GetScrollRange().IsEqualEdges(nsRect(0, 0, 0, 0))) {
         // Scroll bars will be used for overflow
         isFocusable = true;
diff --git a/layout/generic/nsGfxScrollFrame.cpp b/layout/generic/nsGfxScrollFrame.cpp
index 95e4b9bf4..8e7b208e4 100644
--- a/layout/generic/nsGfxScrollFrame.cpp
+++ b/layout/generic/nsGfxScrollFrame.cpp
@@ -263,7 +263,7 @@ struct MOZ_STACK_CLASS ScrollReflowInput {
     // worry about the reflow depth here
   , mBoxState(aState.mFrame->PresContext(), aState.mRenderingContext, 0)
   {
-    ScrollbarStyles styles = aFrame->GetScrollbarStyles();
+    ScrollStyles styles = aFrame->GetScrollStyles();
     mHScrollbar = ShouldShowScrollbar(styles.mHorizontal);
     mVScrollbar = ShouldShowScrollbar(styles.mVertical);  
   }
@@ -808,7 +808,7 @@ nsHTMLScrollFrame::PlaceScrollArea(ScrollReflowInput& aState,
 nscoord
 nsHTMLScrollFrame::GetIntrinsicVScrollbarWidth(nsRenderingContext *aRenderingContext)
 {
-  ScrollbarStyles ss = GetScrollbarStyles();
+  ScrollStyles ss = GetScrollStyles();
   if (ss.mVertical != NS_STYLE_OVERFLOW_SCROLL || !mHelper.mVScrollbarBox)
     return 0;
 
@@ -1161,7 +1161,7 @@ nsHTMLScrollFrame::AccessibleType()
   // Create an accessible regardless of focusable state because the state can be
   // changed during frame life cycle without any notifications to accessibility.
   if (mContent->IsRootOfNativeAnonymousSubtree() ||
-      GetScrollbarStyles().IsHiddenInBothDirections()) {
+      GetScrollStyles().IsHiddenInBothDirections()) {
     return a11y::eNoType;
   }
 
@@ -1320,7 +1320,7 @@ ScrollFrameHelper::WantAsyncScroll() const
     return true;
   }
 
-  ScrollbarStyles styles = GetScrollbarStylesFromFrame();
+  ScrollStyles styles = GetScrollStylesFromFrame();
   nscoord oneDevPixel = GetScrolledFrame()->PresContext()->AppUnitsPerDevPixel();
   nsRect scrollRange = GetScrollRange();
   bool isVScrollable = (scrollRange.height >= oneDevPixel) &&
@@ -1571,7 +1571,7 @@ nsXULScrollFrame::GetXULPrefSize(nsBoxLayoutState& aState)
 
   nsSize pref = mHelper.mScrolledFrame->GetXULPrefSize(aState);
 
-  ScrollbarStyles styles = GetScrollbarStyles();
+  ScrollStyles styles = GetScrollStyles();
 
   // scrolled frames don't have their own margins
 
@@ -1604,7 +1604,7 @@ nsXULScrollFrame::GetXULMinSize(nsBoxLayoutState& aState)
 
   nsSize min = mHelper.mScrolledFrame->GetXULMinSizeForScrollArea(aState);
 
-  ScrollbarStyles styles = GetScrollbarStyles();
+  ScrollStyles styles = GetScrollStyles();
 
   if (mHelper.mVScrollbarBox &&
       styles.mVertical == NS_STYLE_OVERFLOW_SCROLL) {
@@ -2490,7 +2490,7 @@ bool ScrollFrameHelper::IsAlwaysActive() const
 
   // If we're overflow:hidden, then start as inactive until
   // we get scrolled manually.
-  ScrollbarStyles styles = GetScrollbarStylesFromFrame();
+  ScrollStyles styles = GetScrollStylesFromFrame();
   return (styles.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN &&
           styles.mVertical != NS_STYLE_OVERFLOW_HIDDEN);
 }
@@ -3821,21 +3821,21 @@ static void HandleScrollPref(nsIScrollable *aScrollable, int32_t aOrientation,
   }
 }
 
-ScrollbarStyles
-ScrollFrameHelper::GetScrollbarStylesFromFrame() const
+ScrollStyles
+ScrollFrameHelper::GetScrollStylesFromFrame() const
 {
   nsPresContext* presContext = mOuter->PresContext();
   if (!presContext->IsDynamic() &&
       !(mIsRoot && presContext->HasPaginatedScrolling())) {
-    return ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN, NS_STYLE_OVERFLOW_HIDDEN);
+    return ScrollStyles(NS_STYLE_OVERFLOW_HIDDEN, NS_STYLE_OVERFLOW_HIDDEN);
   }
 
   if (!mIsRoot) {
     const nsStyleDisplay* disp = mOuter->StyleDisplay();
-    return ScrollbarStyles(disp);
+    return ScrollStyles(disp);
   }
 
-  ScrollbarStyles result = presContext->GetViewportScrollbarStylesOverride();
+  ScrollStyles result = presContext->GetViewportScrollStylesOverride();
   nsCOMPtr<nsISupports> container = presContext->GetContainerWeak();
   nsCOMPtr<nsIScrollable> scrollable = do_QueryInterface(container);
   if (scrollable) {
@@ -4004,7 +4004,7 @@ ScrollFrameHelper::ScrollBy(nsIntPoint aDelta,
   nsPoint newPos = mDestination + nsPoint(aDelta.x*deltaMultiplier.width, aDelta.y*deltaMultiplier.height);
 
   if (aSnap == nsIScrollableFrame::ENABLE_SNAP) {
-    ScrollbarStyles styles = GetScrollbarStylesFromFrame();
+    ScrollStyles styles = GetScrollStylesFromFrame();
     if (styles.mScrollSnapTypeY != NS_STYLE_SCROLL_SNAP_TYPE_NONE ||
         styles.mScrollSnapTypeX != NS_STYLE_SCROLL_SNAP_TYPE_NONE) {
       nscoord appUnitsPerDevPixel = mOuter->PresContext()->AppUnitsPerDevPixel();
@@ -4412,7 +4412,7 @@ ScrollFrameHelper::CreateAnonymousContent(
   bool canHaveHorizontal;
   bool canHaveVertical;
   if (!mIsRoot) {
-    ScrollbarStyles styles = scrollable->GetScrollbarStyles();
+    ScrollStyles styles = scrollable->GetScrollStyles();
     canHaveHorizontal = styles.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN;
     canHaveVertical = styles.mVertical != NS_STYLE_OVERFLOW_HIDDEN;
     if (!canHaveHorizontal && !canHaveVertical && !isResizable) {
@@ -5094,7 +5094,7 @@ nsXULScrollFrame::XULLayout(nsBoxLayoutState& aState)
    (if we're the viewport and we added or removed a scrollbar).
    **************/
 
-  ScrollbarStyles styles = GetScrollbarStyles();
+  ScrollStyles styles = GetScrollStyles();
 
   // Look at our style do we always have vertical or horizontal scrollbars?
   if (styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL)
@@ -5399,7 +5399,7 @@ bool
 ScrollFrameHelper::ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas)
 {
   nsIScrollableFrame* sf = do_QueryFrame(mOuter);
-  ScrollbarStyles ss = sf->GetScrollbarStyles();
+  ScrollStyles ss = sf->GetScrollStyles();
 
   // Reflow when the change in overflow leads to one of our scrollbars
   // changing or might require repositioning the scrolled content due to
@@ -6121,7 +6121,7 @@ ComputeScrollSnapInfo(const ScrollFrameHelper& aScrollFrame)
 {
   ScrollSnapInfo result;
 
-  ScrollbarStyles styles = aScrollFrame.GetScrollbarStylesFromFrame();
+  ScrollStyles styles = aScrollFrame.GetScrollStylesFromFrame();
 
   if (styles.mScrollSnapTypeY == NS_STYLE_SCROLL_SNAP_TYPE_NONE &&
       styles.mScrollSnapTypeX == NS_STYLE_SCROLL_SNAP_TYPE_NONE) {
diff --git a/layout/generic/nsGfxScrollFrame.h b/layout/generic/nsGfxScrollFrame.h
index 296867856..41957d5e5 100644
--- a/layout/generic/nsGfxScrollFrame.h
+++ b/layout/generic/nsGfxScrollFrame.h
@@ -55,7 +55,7 @@ public:
   ScrollFrameHelper(nsContainerFrame* aOuter, bool aIsRoot);
   ~ScrollFrameHelper();
 
-  mozilla::ScrollbarStyles GetScrollbarStylesFromFrame() const;
+  mozilla::ScrollStyles GetScrollStylesFromFrame() const;
 
   // If a child frame was added or removed on the scrollframe,
   // reload our child frame list.
@@ -775,8 +775,8 @@ public:
   virtual nsIFrame* GetScrolledFrame() const override {
     return mHelper.GetScrolledFrame();
   }
-  virtual mozilla::ScrollbarStyles GetScrollbarStyles() const override {
-    return mHelper.GetScrollbarStylesFromFrame();
+  virtual mozilla::ScrollStyles GetScrollStyles() const override {
+    return mHelper.GetScrollStylesFromFrame();
   }
   virtual uint32_t GetScrollbarVisibility() const override {
     return mHelper.GetScrollbarVisibility();
@@ -1199,8 +1199,8 @@ public:
   virtual nsIFrame* GetScrolledFrame() const override {
     return mHelper.GetScrolledFrame();
   }
-  virtual mozilla::ScrollbarStyles GetScrollbarStyles() const override {
-    return mHelper.GetScrollbarStylesFromFrame();
+  virtual mozilla::ScrollStyles GetScrollStyles() const override {
+    return mHelper.GetScrollStylesFromFrame();
   }
   virtual uint32_t GetScrollbarVisibility() const override {
     return mHelper.GetScrollbarVisibility();
diff --git a/layout/generic/nsIScrollableFrame.h b/layout/generic/nsIScrollableFrame.h
index b7e3caf46..4ad45a528 100644
--- a/layout/generic/nsIScrollableFrame.h
+++ b/layout/generic/nsIScrollableFrame.h
@@ -12,7 +12,7 @@
 
 #include "nsCoord.h"
 #include "DisplayItemClip.h"
-#include "ScrollbarStyles.h"
+#include "ScrollStyles.h"
 #include "mozilla/Maybe.h"
 #include "mozilla/gfx/Point.h"
 #include "nsIScrollbarMediator.h"
@@ -63,7 +63,7 @@ public:
    * or NS_STYLE_OVERFLOW_AUTO) governing the horizontal and vertical
    * scrollbars for this frame.
    */
-  virtual mozilla::ScrollbarStyles GetScrollbarStyles() const = 0;
+  virtual mozilla::ScrollStyles GetScrollStyles() const = 0;
 
   enum { HORIZONTAL = 0x01, VERTICAL = 0x02 };
   /**
diff --git a/layout/style/nsRuleNode.cpp b/layout/style/nsRuleNode.cpp
index 9721b4bed..504b66ac2 100644
--- a/layout/style/nsRuleNode.cpp
+++ b/layout/style/nsRuleNode.cpp
@@ -424,7 +424,7 @@ static nsSize CalcViewportUnitsScale(nsPresContext* aPresContext)
   nsIScrollableFrame* scrollFrame =
     aPresContext->PresShell()->GetRootScrollFrameAsScrollable();
   if (scrollFrame) {
-    ScrollbarStyles styles(scrollFrame->GetScrollbarStyles());
+    ScrollStyles styles(scrollFrame->GetScrollStyles());
 
     if (styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL ||
         styles.mVertical == NS_STYLE_OVERFLOW_SCROLL) {
diff --git a/layout/xul/nsListBoxBodyFrame.cpp b/layout/xul/nsListBoxBodyFrame.cpp
index 8c4a5e2fd..0ff07bd91 100644
--- a/layout/xul/nsListBoxBodyFrame.cpp
+++ b/layout/xul/nsListBoxBodyFrame.cpp
@@ -296,7 +296,7 @@ nsListBoxBodyFrame::GetXULMinSizeForScrollArea(nsBoxLayoutState& aBoxLayoutState
     result.height = 0;
     nsIScrollableFrame* scrollFrame = nsLayoutUtils::GetScrollableFrameFor(this);
     if (scrollFrame &&
-        scrollFrame->GetScrollbarStyles().mVertical == NS_STYLE_OVERFLOW_AUTO) {
+        scrollFrame->GetScrollStyles().mVertical == NS_STYLE_OVERFLOW_AUTO) {
       nsMargin scrollbars =
         scrollFrame->GetDesiredScrollbarSizes(&aBoxLayoutState);
       result.width += scrollbars.left + scrollbars.right;
@@ -316,7 +316,7 @@ nsListBoxBodyFrame::GetXULPrefSize(nsBoxLayoutState& aBoxLayoutState)
 
   nsIScrollableFrame* scrollFrame = nsLayoutUtils::GetScrollableFrameFor(this);
   if (scrollFrame &&
-      scrollFrame->GetScrollbarStyles().mVertical == NS_STYLE_OVERFLOW_AUTO) {
+      scrollFrame->GetScrollStyles().mVertical == NS_STYLE_OVERFLOW_AUTO) {
     nsMargin scrollbars = scrollFrame->GetDesiredScrollbarSizes(&aBoxLayoutState);
     pref.width += scrollbars.left + scrollbars.right;
   }