Bug 1382574 - part3 : remove HTMLMediaElement::mHasUserInteraction. r=jwwang

We won't need to check the whether the media element is interacted with user for
autoplay anymore.

MozReview-Commit-ID: 2tll9LtGyVR

dom/html/HTMLMediaElement.cpp

@@ -1972,13 +1972,7 @@ void HTMLMediaElement::DoLoad()
     return;
   }
 
-  // Detect if user has interacted with element so that play will not be
-  // blocked when initiated by a script. This enables sites to capture user
-  // intent to play by calling load() in the click handler of a "catalog
-  // view" of a gallery of videos.
   if (EventStateManager::IsHandlingUserInput()) {
-    mHasUserInteraction = true;
-
     // Mark the channel as urgent-start when autopaly so that it will play the
     // media from src after loading enough resource.
     if (HasAttr(kNameSpaceID_None, nsGkAtoms::autoplay)) {
@@ -2754,12 +2748,6 @@ HTMLMediaElement::Seek(double aTime,
     return nullptr;
   }
 
-  // Detect if user has interacted with element by seeking so that
-  // play will not be blocked when initiated by a script.
-  if (EventStateManager::IsHandlingUserInput()) {
-    mHasUserInteraction = true;
-  }
-
   StopSuspendingAfterFirstFrame();
 
   if (mSrcStream) {
@@ -4043,7 +4031,6 @@ HTMLMediaElement::HTMLMediaElement(already_AddRefed<mozilla::dom::NodeInfo>& aNo
     mIsEncrypted(false),
     mWaitingForKey(NOT_WAITING_FOR_KEY),
     mDisableVideo(false),
-    mHasUserInteraction(false),
     mFirstFrameLoaded(false),
     mDefaultPlaybackStartPosition(0.0),
     mHasSuspendTaint(false),
@@ -4228,9 +4215,6 @@ HTMLMediaElement::PlayInternal(ErrorResult& aRv)
   }
   mPendingPlayPromises.AppendElement(promise);
 
-  // Play was not blocked so assume user interacted with the element.
-  mHasUserInteraction = true;
-
   if (mPreloadAction == HTMLMediaElement::PRELOAD_NONE) {
     // The media load algorithm will be initiated by a user interaction.
     // We want to boost the channel priority for better responsiveness.