blink: Cleanup class/struct forward declarations

third_party/WebKit/Source/modules/peerconnection/RTCDataChannel.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 24 matching lines @@
 #include "public/platform/WebRTCDataChannelHandlerClient.h"
 #include "wtf/Compiler.h"
 #include <memory>
 
 namespace blink {
 
 class Blob;
 class DOMArrayBuffer;
 class DOMArrayBufferView;
 class ExceptionState;
-class RTCPeerConnection;
 class WebRTCDataChannelHandler;
 class WebRTCPeerConnectionHandler;
 struct WebRTCDataChannelInit;
 
 class MODULES_EXPORT RTCDataChannel final
     : public EventTargetWithInlineData,
       NON_EXPORTED_BASE(public WebRTCDataChannelHandlerClient),
       public ActiveScriptWrappable,
       public ActiveDOMObject {
   USING_GARBAGE_COLLECTED_MIXIN(RTCDataChannel);
@@ skipping 86 matching lines @@
   unsigned m_bufferedAmountLowThreshold;
 
   bool m_stopped;
 
   FRIEND_TEST_ALL_PREFIXES(RTCDataChannelTest, BufferedAmountLow);
 };
 
 }  // namespace blink
 
 #endif  // RTCDataChannel_h