Hoist checks for 'disabled' tracks out of textTrackAddCue{,s}

Source/core/html/track/TextTrack.cpp

Index: Source/core/html/track/TextTrack.cpp
diff --git a/Source/core/html/track/TextTrack.cpp b/Source/core/html/track/TextTrack.cpp
index 6b3941845c9482fde2e97b674bd062f5735bcfeb..f46fc5d053c75590de97635cef01e14e120296a2 100644
--- a/Source/core/html/track/TextTrack.cpp
+++ b/Source/core/html/track/TextTrack.cpp
@@ -247,7 +247,7 @@ void TextTrack::addCue(PassRefPtrWillBeRawPtr<TextTrackCue> prpCue)
     cue->setTrack(this);
     ensureTextTrackCueList()->add(cue);
 
-    if (mediaElement())
+    if (mediaElement() && m_mode != disabledKeyword())
         mediaElement()->textTrackAddCue(this, cue.get());
 }
 
@@ -367,7 +367,10 @@ void TextTrack::cueDidChange(TextTrackCue* cue)
     // Make sure the TextTrackCueList order is up-to-date.
     ensureTextTrackCueList()->updateCueIndex(cue);
 
-    // ... and add it back again.
+    // ... and add it back again if the track is enabled.
+    if (m_mode == disabledKeyword())
+        return;
+
     mediaElement()->textTrackAddCue(this, cue);
 }