Push cue timeline management out of LoadableTextTrack

Source/core/loader/TextTrackLoader.h

Index: Source/core/loader/TextTrackLoader.h
diff --git a/Source/core/loader/TextTrackLoader.h b/Source/core/loader/TextTrackLoader.h
index 1e45eb995d7670062b8ff5d6e1ec0d3f69bc4b46..0570ee4d773f3f7e6707f48ad40b8ff237365c0b 100644
--- a/Source/core/loader/TextTrackLoader.h
+++ b/Source/core/loader/TextTrackLoader.h
@@ -63,8 +63,8 @@ public:
     enum State { Idle, Loading, Finished, Failed };
     State loadState() { return m_state; }
 
-    void getNewCues(WillBeHeapVector<RefPtrWillBeMember<VTTCue> >& outputCues);
-    void getNewRegions(WillBeHeapVector<RefPtrWillBeMember<VTTRegion> >& outputRegions);
+    void getNewCues(WillBeHeapVector<RefPtrWillBeMember<TextTrackCue>>& outputCues);
+    void getNewRegions(WillBeHeapVector<RefPtrWillBeMember<VTTRegion>>& outputRegions);
 
     void trace(Visitor*);