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

Source/web/WebSocketChannelClientProxy.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebSocketChannelClientProxy_h
 #define WebSocketChannelClientProxy_h
 
 #include "modules/websockets/WebSocketChannelClient.h"
 #include "platform/heap/Handle.h"
 #include "web/WebSocketImpl.h"
@@ skipping 25 matching lines @@
         m_impl->didReceiveTextMessage(payload);
     }
     virtual void didReceiveBinaryMessage(PassOwnPtr<Vector<char> > payload) override
     {
         m_impl->didReceiveBinaryMessage(payload);
     }
     virtual void didError() override
     {
         m_impl->didError();
     }
-    virtual void didConsumeBufferedAmount(unsigned long consumed) override
+    virtual void didConsumeBufferedAmount(unsigned consumed) override
     {
         m_impl->didConsumeBufferedAmount(consumed);
     }
     virtual void didStartClosingHandshake() override
     {
         m_impl->didStartClosingHandshake();
     }
     virtual void didClose(ClosingHandshakeCompletionStatus status, unsigned short code, const String& reason) override
     {
         WebSocketImpl* impl = m_impl;
         m_impl = nullptr;
         impl->didClose(status, code, reason);
     }
 
 private:
     explicit WebSocketChannelClientProxy(WebSocketImpl* impl)
         : m_impl(impl)
     {
     }
 
     WebSocketImpl* m_impl;
 };
 
 } // namespace blink
 
 #endif // WebSocketChannelClientProxy_h