Add more missing closing namespace comments.

third_party/WebKit/Source/platform/PrerenderClient.h

 /*
  * Copyright (C) 2012 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 28 matching lines @@
 class PLATFORM_EXPORT PrerenderClient {
 public:
     virtual ~PrerenderClient() { }
 
     virtual void didStartPrerender() = 0;
     virtual void didStopPrerender() = 0;
     virtual void didSendLoadForPrerender() = 0;
     virtual void didSendDOMContentLoadedForPrerender() = 0;
 };
 
-}
-
+} // namespace blink
 
 #endif