Correct data size argument type in resource loading path to unsigned

Source/core/workers/WorkerScriptLoader.h

 /*
  * Copyright (C) 2009 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009, 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:
  * 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
@@ skipping 54 matching lines @@
 
         void setClient(WorkerScriptLoaderClient* client) { m_client = client; }
 
         String script();
         const KURL& url() const { return m_url; }
         const KURL& responseURL() const;
         bool failed() const { return m_failed; }
         unsigned long identifier() const { return m_identifier; }
 
         virtual void didReceiveResponse(unsigned long /*identifier*/, const ResourceResponse&) OVERRIDE;
-        virtual void didReceiveData(const char* data, int dataLength) OVERRIDE;
+        virtual void didReceiveData(const char* data, unsigned dataLength) OVERRIDE;
         virtual void didFinishLoading(unsigned long identifier, double) OVERRIDE;
         virtual void didFail(const ResourceError&) OVERRIDE;
         virtual void didFailRedirectCheck() OVERRIDE;
 
         void setRequestContext(blink::WebURLRequest::RequestContext requestContext) { m_requestContext = requestContext; }
 
     private:
         friend class WTF::RefCounted<WorkerScriptLoader>;
 
         WorkerScriptLoader();
@@ skipping 11 matching lines @@
         KURL m_responseURL;
         bool m_failed;
         unsigned long m_identifier;
         bool m_finishing;
         blink::WebURLRequest::RequestContext m_requestContext;
     };
 
 } // namespace blink
 
 #endif // WorkerScriptLoader_h