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..375b14a2858b70bcc09df2e5f84854934b86a229 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;
@@ -318,7 +322,7 @@ void TextTrackList::scheduleRemoveTrackEvent(PassRefPtr<TextTrack> track)
     scheduleTrackEvent(EventTypeNames::removetrack, track);
 }
 
-Node* TextTrackList::owner() const
+HTMLMediaElement* TextTrackList::owner() const
 {
     return m_owner;
 }