DOMWebSocket::bufferedAmount() should not return an "unsigned long"

Source/modules/websockets/WorkerWebSocketChannel.h

 /*
  * 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 91 matching lines @@
         void close(int code, const String& reason);
         void fail(const String& reason, MessageLevel, const String& sourceURL, unsigned lineNumber);
         void disconnect();
 
         virtual void trace(Visitor*) override;
 
         // WebSocketChannelClient functions.
         virtual void didConnect(const String& subprotocol, const String& extensions) override;
         virtual void didReceiveTextMessage(const String& payload) override;
         virtual void didReceiveBinaryMessage(PassOwnPtr<Vector<char> >) override;
-        virtual void didConsumeBufferedAmount(unsigned long) override;
+        virtual void didConsumeBufferedAmount(unsigned) override;
         virtual void didStartClosingHandshake() override;
         virtual void didClose(ClosingHandshakeCompletionStatus, unsigned short code, const String& reason) override;
         virtual void didError() override;
 
     private:
         void initializeInternal(ExecutionContext*, const String& sourceURLAtConnection, unsigned lineNumberAtConnection);
 
         Member<Bridge> m_bridge;
         WorkerLoaderProxy& m_loaderProxy;
         Member<WebSocketChannel> m_mainWebSocketChannel;
@@ skipping 38 matching lines @@
     WorkerWebSocketChannel(WorkerGlobalScope&, WebSocketChannelClient*, const String& sourceURL, unsigned lineNumber);
 
     Member<Bridge> m_bridge;
     String m_sourceURLAtConnection;
     unsigned m_lineNumberAtConnection;
 };
 
 } // namespace blink
 
 #endif // WorkerWebSocketChannel_h