Add more missing closing namespace comments.

third_party/WebKit/Source/bindings/core/v8/V8GCForContextDispose.h

 /*
  * Copyright (C) 2010 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 36 matching lines @@
 private:
     V8GCForContextDispose(); // Use instance() instead.
     void pseudoIdleTimerFired(Timer<V8GCForContextDispose>*);
     void reset();
 
     Timer<V8GCForContextDispose> m_pseudoIdleTimer;
     bool m_didDisposeContextForMainFrame;
     double m_lastContextDisposalTime;
 };
 
-}
+} // namespace blink
 
 #endif // V8GCForContextDispose_h