Bug 1509446 - part4 : remove set dirty. r=jya

As the `active cues list` would be automatically contruct when there are any active cues being added or inactive cues being removed, we have no need to use dirty to reset the `active cues list`.

Differential Revision: https://phabricator.services.mozilla.com/D22150

--HG--
extra : moz-landing-system : lando

dom/html/TextTrackManager.cpp

@@ -230,9 +230,6 @@ void TextTrackManager::RemoveTextTrack(TextTrack* aTextTrack,
 
 void TextTrackManager::DidSeek() {
   WEBVTT_LOG("%p DidSeek", this);
-  if (mTextTracks) {
-    mTextTracks->DidSeek();
-  }
   if (mMediaElement) {
     mLastTimeMarchesOnCalled = mMediaElement->CurrentTime();
     WEBVTT_LOGV("DidSeek set mLastTimeMarchesOnCalled %lf",

dom/media/TextTrack.cpp

@@ -128,7 +128,6 @@ void TextTrack::AddCue(TextTrackCue& aCue) {
       mediaElement->NotifyCueAdded(aCue);
     }
   }
-  SetDirty();
 }
 
 void TextTrack::RemoveCue(TextTrackCue& aCue, ErrorResult& aRv) {
@@ -145,7 +144,6 @@ void TextTrack::RemoveCue(TextTrackCue& aCue, ErrorResult& aRv) {
       mediaElement->NotifyCueRemoved(aCue);
     }
   }
-  SetDirty();
 }
 
 void TextTrack::SetCuesDirty() {
@@ -212,7 +210,6 @@ void TextTrack::NotifyCueUpdated(TextTrackCue* aCue) {
       mediaElement->NotifyCueUpdated(aCue);
     }
   }
-  SetDirty();
 }
 
 void TextTrack::GetLabel(nsAString& aLabel) const {

dom/media/TextTrackList.cpp

@@ -105,12 +105,6 @@ void TextTrackList::RemoveTextTrack(TextTrack* aTrack) {
   }
 }
 
-void TextTrackList::DidSeek() {
-  for (uint32_t i = 0; i < mTextTracks.Length(); i++) {
-    mTextTracks[i]->SetDirty();
-  }
-}
-
 class TrackEventRunner : public Runnable {
  public:
   TrackEventRunner(TextTrackList* aList, Event* aEvent)

dom/media/TextTrackList.h

@@ -50,7 +50,6 @@ class TextTrackList final : public DOMEventTargetHelper {
   void AddTextTrack(TextTrack* aTextTrack, const CompareTextTracks& aCompareTT);
 
   void RemoveTextTrack(TextTrack* aTrack);
-  void DidSeek();
 
   HTMLMediaElement* GetMediaElement();
   void SetTextTrackManager(TextTrackManager* aTextTrackManager);