| Index: Source/core/html/track/VideoTrack.cpp | 
| diff --git a/Source/core/html/track/VideoTrack.cpp b/Source/core/html/track/VideoTrack.cpp | 
| index 86d26b57cf077973b8ab39a406cdc856d6914768..12bb0f28bc70e087562e212bf57edefa8a67c2e2 100644 | 
| --- a/Source/core/html/track/VideoTrack.cpp | 
| +++ b/Source/core/html/track/VideoTrack.cpp | 
| @@ -69,14 +69,15 @@ const AtomicString& VideoTrack::commentaryKeyword() | 
| return keyword; | 
| } | 
|  | 
| -bool VideoTrack::isValidKind(const AtomicString& kind) const | 
| +bool VideoTrack::isValidKindKeyword(const String& kind) | 
| { | 
| return (kind == alternativeKeyword()) | 
| || (kind == captionsKeyword()) | 
| || (kind == mainKeyword()) | 
| || (kind == signKeyword()) | 
| || (kind == subtitlesKeyword()) | 
| -        || (kind == commentaryKeyword()); | 
| +        || (kind == commentaryKeyword()) | 
| +        || (kind == emptyAtom); | 
| } | 
|  | 
| AtomicString VideoTrack::defaultKind() const | 
|  |