Prevent 'removetrack' events from firing when all inband text tracks are removed.

Source/core/html/track/TextTrackList.cpp

Index: Source/core/html/track/TextTrackList.cpp
diff --git a/Source/core/html/track/TextTrackList.cpp b/Source/core/html/track/TextTrackList.cpp
index 588e3768c9aa5368e9406d72f08b47160df738bf..cd429a9d64b70a79d7b6ed7aee1f6a1cef54bf64 100644
--- a/Source/core/html/track/TextTrackList.cpp
+++ b/Source/core/html/track/TextTrackList.cpp
@@ -198,7 +198,7 @@ void TextTrackList::append(PassRefPtr<TextTrack> prpTrack)
     scheduleAddTrackEvent(track.release());
 }
 
-void TextTrackList::remove(TextTrack* track)
+void TextTrackList::remove(TextTrack* track, bool scheduleEvent)
 {
     Vector<RefPtr<TextTrack> >* tracks = 0;
     RefPtr<InbandTextTrack> inbandTrack;
@@ -228,7 +228,8 @@ void TextTrackList::remove(TextTrack* track)
     if (inbandTrack)
         inbandTrack->trackRemoved();
 
-    scheduleRemoveTrackEvent(track);
+    if (scheduleEvent)
+        scheduleRemoveTrackEvent(track);
 }
 
 bool TextTrackList::contains(TextTrack* track) const