From 5f12940329ba496da5730863cae94cd8c0b145da Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <email@mattatobin.com>
Date: Fri, 17 Apr 2020 06:34:38 -0400
Subject: Bug 1396584 - Remove support for multiple ShadowRoots

Tag #1375
---
 dom/base/ShadowRoot.h | 51 ++-------------------------------------------------
 1 file changed, 2 insertions(+), 49 deletions(-)

(limited to 'dom/base/ShadowRoot.h')

diff --git a/dom/base/ShadowRoot.h b/dom/base/ShadowRoot.h
index e76e4ab3f..04943752b 100644
--- a/dom/base/ShadowRoot.h
+++ b/dom/base/ShadowRoot.h
@@ -25,7 +25,6 @@ namespace dom {
 
 class Element;
 class HTMLContentElement;
-class HTMLShadowElement;
 class ShadowRootStyleSheetList;
 
 class ShadowRoot final : public DocumentFragment,
@@ -42,7 +41,8 @@ public:
   NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
   NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
 
-  ShadowRoot(Element* aElement, already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
+  ShadowRoot(Element* aElement,
+             already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
              nsXBLPrototypeBinding* aProtoBinding);
 
   void AddToIdTable(Element* aElement, nsIAtom* aId);
@@ -52,24 +52,6 @@ public:
   bool ApplyAuthorStyles();
   void SetApplyAuthorStyles(bool aApplyAuthorStyles);
   StyleSheetList* StyleSheets();
-  HTMLShadowElement* GetShadowElement() { return mShadowElement; }
-
-  /**
-   * Sets the current shadow insertion point where the older
-   * ShadowRoot will be projected.
-   */
-  void SetShadowElement(HTMLShadowElement* aShadowElement);
-
-  /**
-   * Change the node that populates the distribution pool with
-   * its children. This is distinct from the ShadowRoot host described
-   * in the specifications. The ShadowRoot host is the element
-   * which created this ShadowRoot and does not change. The pool host
-   * is the same as the ShadowRoot host if this is the youngest
-   * ShadowRoot. If this is an older ShadowRoot, the pool host is
-   * the <shadow> element in the younger ShadowRoot (if it exists).
-   */
-  void ChangePoolHost(nsIContent* aNewHost);
 
   /**
    * Distributes a single explicit child of the pool host to the content
@@ -92,23 +74,15 @@ public:
   void AddInsertionPoint(HTMLContentElement* aInsertionPoint);
   void RemoveInsertionPoint(HTMLContentElement* aInsertionPoint);
 
-  void SetYoungerShadow(ShadowRoot* aYoungerShadow);
-  ShadowRoot* GetYoungerShadowRoot() { return mYoungerShadow; }
   void SetInsertionPointChanged() { mInsertionPointChanged = true; }
 
   void SetAssociatedBinding(nsXBLBinding* aBinding) { mAssociatedBinding = aBinding; }
 
-  nsISupports* GetParentObject() const { return mPoolHost; }
-
-  nsIContent* GetPoolHost() { return mPoolHost; }
-  nsTArray<HTMLShadowElement*>& ShadowDescendants() { return mShadowDescendants; }
-
   JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
 
   static bool IsPooledNode(nsIContent* aChild, nsIContent* aContainer,
                            nsIContent* aHost);
   static ShadowRoot* FromNode(nsINode* aNode);
-  static bool IsShadowInsertionPoint(nsIContent* aContent);
 
   static void RemoveDestInsertionPoint(nsIContent* aInsertionPoint,
                                        nsTArray<nsIContent*>& aDestInsertionPoints);
@@ -125,7 +99,6 @@ public:
   void GetInnerHTML(nsAString& aInnerHTML);
   void SetInnerHTML(const nsAString& aInnerHTML, ErrorResult& aError);
   Element* Host();
-  ShadowRoot* GetOlderShadowRoot() { return mOlderShadow; }
   void StyleSheetChanged();
 
   bool IsComposedDocParticipant() { return mIsComposedDocParticipant; }
@@ -134,14 +107,9 @@ public:
     mIsComposedDocParticipant = aIsComposedDocParticipant;
   }
 
-  virtual void DestroyContent() override;
 protected:
   virtual ~ShadowRoot();
 
-  // The pool host is the parent of the nodes that will be distributed
-  // into the insertion points in this ShadowRoot. See |ChangeShadowRoot|.
-  nsCOMPtr<nsIContent> mPoolHost;
-
   // An array of content insertion points that are a descendant of the ShadowRoot
   // sorted in tree order. Insertion points are responsible for notifying
   // the ShadowRoot when they are removed or added as a descendant. The insertion
@@ -149,10 +117,6 @@ protected:
   // by the array.
   nsTArray<HTMLContentElement*> mInsertionPoints;
 
-  // An array of the <shadow> elements that are descendant of the ShadowRoot
-  // sorted in tree order. Only the first may be a shadow insertion point.
-  nsTArray<HTMLShadowElement*> mShadowDescendants;
-
   nsTHashtable<nsIdentifierMapEntry> mIdentifierMap;
   nsXBLPrototypeBinding* mProtoBinding;
 
@@ -163,17 +127,6 @@ protected:
 
   RefPtr<ShadowRootStyleSheetList> mStyleSheetList;
 
-  // The current shadow insertion point of this ShadowRoot.
-  HTMLShadowElement* mShadowElement;
-
-  // The ShadowRoot that was created by the host element before
-  // this ShadowRoot was created.
-  RefPtr<ShadowRoot> mOlderShadow;
-
-  // The ShadowRoot that was created by the host element after
-  // this ShadowRoot was created.
-  RefPtr<ShadowRoot> mYoungerShadow;
-
   // A boolean that indicates that an insertion point was added or removed
   // from this ShadowRoot and that the nodes need to be redistributed into
   // the insertion points. After this flag is set, nodes will be distributed
-- 
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