Cleanup namespace usage in public/platform/{Web[P-W]*,linux/*}.h

public/platform/WebRTCDataChannelHandler.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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  */
 
 #ifndef WebRTCDataChannelHandler_h
 #define WebRTCDataChannelHandler_h
 
 #include "WebCommon.h"
 #include "WebPrivatePtr.h"
 #include "WebString.h"
 
 namespace blink {
+
 class WebRTCDataChannelHandlerClient;
 
 class WebRTCDataChannelHandler {
 public:
     virtual ~WebRTCDataChannelHandler() { }
 
     virtual void setClient(WebRTCDataChannelHandlerClient*) = 0;
 
     virtual WebString label() = 0;
 
     // DEPRECATED
     virtual bool isReliable() { return true; }
 
     virtual bool ordered() const = 0;
     virtual unsigned short maxRetransmitTime() const = 0;
     virtual unsigned short maxRetransmits() const = 0;
     virtual WebString protocol() const = 0;
     virtual bool negotiated() const = 0;
     virtual unsigned short id() const = 0;
 
     virtual unsigned long bufferedAmount() = 0;
     virtual bool sendStringData(const WebString&) = 0;
     virtual bool sendRawData(const char*, size_t) = 0;
     virtual void close() = 0;
 };
 
 } // namespace blink
 
 #endif // WebRTCDataChannelHandler_h