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..2edb743e8e2ea5011f1f6e3e6cf027cd562e4258 100644
--- a/Source/core/html/track/TextTrackList.cpp
+++ b/Source/core/html/track/TextTrackList.cpp
@@ -201,7 +201,6 @@ void TextTrackList::append(PassRefPtr<TextTrack> prpTrack)
 void TextTrackList::remove(TextTrack* track)
 {
     Vector<RefPtr<TextTrack> >* tracks = 0;
-    RefPtr<InbandTextTrack> inbandTrack;
 
     if (track->trackType() == TextTrack::TrackElement) {
         tracks = &m_elementTracks;
@@ -209,7 +208,6 @@ void TextTrackList::remove(TextTrack* track)
         tracks = &m_addTrackTracks;
     } else if (track->trackType() == TextTrack::InBand) {
         tracks = &m_inbandTracks;
-        inbandTrack = static_cast<InbandTextTrack*>(track);
     } else {
         ASSERT_NOT_REACHED();
     }
@@ -225,12 +223,18 @@ void TextTrackList::remove(TextTrack* track)
 
     tracks->remove(index);
 
-    if (inbandTrack)
-        inbandTrack->trackRemoved();
-
     scheduleRemoveTrackEvent(track);
 }
 
+void TextTrackList::removeAllInbandTracks()
+{
+    for (unsigned i = 0; i < m_inbandTracks.size(); ++i) {
+        m_inbandTracks[i]->invalidateTrackIndex();
+        m_inbandTracks[i]->setTrackList(0);
+    }
+    m_inbandTracks.clear();
+}
+
 bool TextTrackList::contains(TextTrack* track) const
 {
     const Vector<RefPtr<TextTrack> >* tracks = 0;