Rename text track methods to make way for audio & video tracks.

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 ba8ca1aea8f759f1a53575c5f100be8f5627e0d7..588e3768c9aa5368e9406d72f08b47160df738bf 100644
--- a/Source/core/html/track/TextTrackList.cpp
+++ b/Source/core/html/track/TextTrackList.cpp
@@ -258,6 +258,14 @@ ExecutionContext* TextTrackList::executionContext() const
     return m_owner->executionContext();
 }
 
+void TextTrackList::clearOwnerAndClients()
+{
+    m_owner = 0;
+
+    for (unsigned i = 0; i < length(); ++i)
+        item(i)->clearClient();
+}
+
 void TextTrackList::scheduleTrackEvent(const AtomicString& eventName, PassRefPtr<TextTrack> track)
 {
     TrackEventInit initializer;