Cleanup namespace usage in public/web/Web[N-Z]*.h.

public/web/WebPrerendererClient.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 25 matching lines @@
 
 namespace blink {
 
 class WebPrerender;
 
 class WebPrerendererClient {
 public:
     virtual void willAddPrerender(WebPrerender*) = 0;
 };
 
-} // namespace WebPrerendererClient_h
+} // namespace blink
 
 #endif // WebPrerendererClient_h