Change "invalid value default" for HTMLTrackElement 'kind' to "metadata"

third_party/WebKit/Source/core/html/track/LoadableTextTrack.cpp

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #include "core/html/track/LoadableTextTrack.h"
 
 #include "core/dom/ElementTraversal.h"
 #include "core/html/HTMLTrackElement.h"
 #include "core/html/track/vtt/VTTRegionList.h"
 
 namespace blink {
 
 LoadableTextTrack::LoadableTextTrack(HTMLTrackElement* track)
-    : TextTrack(emptyAtom, emptyAtom, emptyAtom, emptyAtom, TrackElement)
+    : TextTrack(subtitlesKeyword(), emptyAtom, emptyAtom, emptyAtom, TrackElement)
     , m_trackElement(track)
 {
 }
 
 LoadableTextTrack::~LoadableTextTrack()
 {
 }
 
 bool LoadableTextTrack::isDefault() const
 {
@@ skipping 34 matching lines @@
     return 0;
 }
 
 DEFINE_TRACE(LoadableTextTrack)
 {
     visitor->trace(m_trackElement);
     TextTrack::trace(visitor);
 }
 
 } // namespace blink