Add more missing closing namespace comments.

third_party/WebKit/Source/core/html/track/vtt/VTTTokenizer.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 241 matching lines @@
             WEBVTT_ADVANCE_TO(TimestampTagState);
         }
         END_STATE()
 
     }
 
     ASSERT_NOT_REACHED();
     return false;
 }
 
-}
-
+} // namespace blink