Cleanup namespace usage in Source/web/Web[I-Z]*.cpp

Source/web/WebMediaStreamRegistry.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 21 matching lines @@
 
 #include "public/web/WebMediaStreamRegistry.h"
 
 #include "modules/mediastream/MediaStreamRegistry.h"
 #include "platform/mediastream/MediaStreamDescriptor.h"
 #include "platform/weborigin/KURL.h"
 #include "public/platform/WebMediaStream.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
 
-using namespace blink;
-
 namespace blink {
 
 WebMediaStream WebMediaStreamRegistry::lookupMediaStreamDescriptor(const WebURL& url)
 {
     return WebMediaStream(MediaStreamRegistry::registry().lookupMediaStreamDescriptor(KURL(url).string()));
 }
 
 } // namespace blink