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

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

 /*
  * Copyright (C) 2012 Apple 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 26 matching lines @@
 using blink::WebString;
 
 namespace blink {
 
 InbandTextTrack* InbandTextTrack::create(WebInbandTextTrack* webTrack)
 {
     return new InbandTextTrack(webTrack);
 }
 
 InbandTextTrack::InbandTextTrack(WebInbandTextTrack* webTrack)
-    : TextTrack(emptyAtom, webTrack->label(), webTrack->language(), webTrack->id(), InBand)
+    : TextTrack(subtitlesKeyword(), webTrack->label(), webTrack->language(), webTrack->id(), InBand)
     , m_webTrack(webTrack)
 {
     m_webTrack->setClient(this);
 
     switch (m_webTrack->kind()) {
     case WebInbandTextTrack::KindSubtitles:
         setKind(TextTrack::subtitlesKeyword());
         break;
     case WebInbandTextTrack::KindCaptions:
         setKind(TextTrack::captionsKeyword());
@@ skipping 35 matching lines @@
 {
     HTMLMediaElement* owner = mediaElement();
     ASSERT(owner);
     VTTCue* cue = VTTCue::create(owner->document(), start, end, content);
     cue->setId(id);
     cue->parseSettings(settings);
     addCue(cue);
 }
 
 } // namespace blink