3 files changed, 4 insertions, 28 deletions
diff --git a/dom/events/Event.cpp b/dom/events/Event.cpp
index aff65b40f..2f8800fb4 100755
--- a/dom/events/Event.cpp
+++ b/dom/events/Event.cpp
@@ -45,9 +45,6 @@ extern bool IsCurrentThreadRunningChromeWorker();
 
 static char *sPopupAllowedEvents;
 
-static bool sReturnHighResTimeStamp = false;
-static bool sReturnHighResTimeStampIsSet = false;
-
 Event::Event(EventTarget* aOwner,
              nsPresContext* aPresContext,
              WidgetEvent* aEvent)
@@ -68,13 +65,6 @@ Event::ConstructorInit(EventTarget* aOwner,
   SetOwner(aOwner);
   mIsMainThreadEvent = NS_IsMainThread();
 
-  if (mIsMainThreadEvent && !sReturnHighResTimeStampIsSet) {
-    Preferences::AddBoolVarCache(&sReturnHighResTimeStamp,
-                                 "dom.event.highrestimestamp.enabled",
-                                 sReturnHighResTimeStamp);
-    sReturnHighResTimeStampIsSet = true;
-  }
-
   mPrivateDataDuplicated = false;
   mWantsPopupControlCheck = false;
 
@@ -1093,10 +1083,6 @@ Event::TimeStamp() const
 double
 Event::TimeStampImpl() const
 {
-  if (!sReturnHighResTimeStamp) {
-    return static_cast<double>(mEvent->mTime);
-  }
-
   if (mEvent->mTimeStamp.IsNull()) {
     return 0.0;
   }
diff --git a/dom/events/test/test_eventTimeStamp.html b/dom/events/test/test_eventTimeStamp.html
index 056203e92..5ca5cd47d 100644
--- a/dom/events/test/test_eventTimeStamp.html
+++ b/dom/events/test/test_eventTimeStamp.html
@@ -35,12 +35,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=77992
 SimpleTest.waitForExplicitFinish();
 SimpleTest.requestFlakyTimeout("untriaged");
 
-// We don't use SpecialPowers.pushPrefEnv since it can delay the test
-// function until after the load event has fired which means we can't
-// test the timestamp of the load event.
-const kPrefName = "dom.event.highrestimestamp.enabled";
-var prevPrefValue = SpecialPowers.getBoolPref(kPrefName);
-SpecialPowers.setBoolPref(kPrefName, true);
 testRegularEvents();
 
 // Event.timeStamp should be relative to the time origin which is:
diff --git a/dom/smil/test/test_smilTimeEvents.xhtml b/dom/smil/test/test_smilTimeEvents.xhtml
index bf6924ddb..002be5539 100644
--- a/dom/smil/test/test_smilTimeEvents.xhtml
+++ b/dom/smil/test/test_smilTimeEvents.xhtml
@@ -236,14 +236,10 @@ function sanityCheckEvent(evt)
   is(evt.eventPhase, evt.AT_TARGET);
   is(evt.bubbles, false, "Event should not bubble");
   is(evt.cancelable, false, "Event should not be cancelable");
-  if (SpecialPowers.getBoolPref("dom.event.highrestimestamp.enabled")) {
-    var now = window.performance.now();
-    ok(evt.timeStamp > 0 && evt.timeStamp < now,
-       "Event timeStamp (" + evt.timeStamp + ") should be > 0 but " +
-       "before the current time (" + now + ")");
-  } else {
-    is(evt.timeStamp, 0, "Event timeStamp should be 0");
-  }
+  var now = window.performance.now();
+  ok(evt.timeStamp > 0 && evt.timeStamp < now,
+     "Event timeStamp (" + evt.timeStamp + ") should be > 0 but " +
+     "before the current time (" + now + ")");
   ok(evt.view !== null, "Event view not set");
 }