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

third_party/WebKit/Source/core/html/track/VideoTrack.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef VideoTrack_h
 #define VideoTrack_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/html/track/TrackBase.h"
@@ skipping 27 matching lines @@
     static const AtomicString& subtitlesKeyword();
     static const AtomicString& commentaryKeyword();
 
     static bool isValidKindKeyword(const String&);
 
 private:
     VideoTrack(const String& id, const AtomicString& kind, const AtomicString& label, const AtomicString& language, bool selected);
 
     // TrackBase
     bool isValidKind(const AtomicString& kind) const override { return isValidKindKeyword(kind); }
-    AtomicString defaultKind() const override;
+    AtomicString invalidValueDefaultKind() const override;
 
     bool m_selected;
 };
 
 DEFINE_TRACK_TYPE_CASTS(VideoTrack, WebMediaPlayer::VideoTrack);
 
 } // namespace blink
 
 #endif // VideoTrack_h