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

Source/modules/websockets/WebSocketChannelClient.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 27 matching lines @@
 
 namespace blink {
 
 class WebSocketChannelClient : public GarbageCollectedMixin {
 public:
     virtual ~WebSocketChannelClient() { }
     virtual void didConnect(const String& subprotocol, const String& extensions) { }
     virtual void didReceiveTextMessage(const String&) { }
     virtual void didReceiveBinaryMessage(PassOwnPtr<Vector<char> >) { }
     virtual void didError() { }
-    virtual void didConsumeBufferedAmount(unsigned long consumed) { }
+    virtual void didConsumeBufferedAmount(unsigned consumed) { }
     virtual void didStartClosingHandshake() { }
     enum ClosingHandshakeCompletionStatus {
         ClosingHandshakeIncomplete,
         ClosingHandshakeComplete
     };
     virtual void didClose(ClosingHandshakeCompletionStatus, unsigned short /* code */, const String& /* reason */) { }
     virtual void trace(Visitor*) { }
 
 protected:
     WebSocketChannelClient() { }
 };
 
 } // namespace blink
 
 #endif // WebSocketChannelClient_h