[WebSocket] bufferedAmount should not decrease inside a task.

Source/modules/websockets/WebSocketChannel.h

 /*
  * Copyright (C) 2009 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 70 matching lines @@
     };
 
     virtual bool connect(const KURL&, const String& protocol) = 0;
     virtual SendResult send(const String& message) = 0;
     virtual SendResult send(const ArrayBuffer&, unsigned byteOffset, unsigned byteLength) = 0;
     virtual SendResult send(PassRefPtr<BlobDataHandle>) = 0;
 
     // For WorkerThreadableWebSocketChannel.
     virtual SendResult send(PassOwnPtr<Vector<char> >) = 0;
 
-    virtual unsigned long bufferedAmount() const = 0;
     virtual void close(int code, const String& reason) = 0;
 
     // Log the reason text and close the connection. Will call didClose().
     // The MessageLevel parameter will be used for the level of the message
     // shown at the devtool console.
     // sourceURL and lineNumber parameters may be shown with the reason text
     // at the devtool console.
     // Even if sourceURL and lineNumber are specified, they may be ignored
     // and the "current" url and the line number in the sense of
     // JavaScript execution may be shown if this method is called in
     // a JS execution context.
     // You can specify String() and 0 for sourceURL and lineNumber
     // respectively, if you can't / needn't provide the information.
     virtual void fail(const String& reason, MessageLevel, const String& sourceURL, unsigned lineNumber) = 0;
 
     virtual void disconnect() = 0; // Will suppress didClose().
 
     virtual void suspend() = 0;
     virtual void resume() = 0;
 
     virtual ~WebSocketChannel() { }
 
     virtual void trace(Visitor*) { }
 };
 
 } // namespace WebCore
 
 #endif // WebSocketChannel_h