Correct data size argument type in resource loading path to unsigned

Source/core/loader/ThreadableLoaderClient.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 29 matching lines @@
     class ResourceError;
     class ResourceResponse;
 
     class ThreadableLoaderClient {
         WTF_MAKE_NONCOPYABLE(ThreadableLoaderClient);
         WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     public:
         virtual void didSendData(unsigned long long /*bytesSent*/, unsigned long long /*totalBytesToBeSent*/) { }
 
         virtual void didReceiveResponse(unsigned long /*identifier*/, const ResourceResponse&) { }
-        virtual void didReceiveData(const char*, int /*dataLength*/) { }
+        virtual void didReceiveData(const char*, unsigned /*dataLength*/) { }
         virtual void didReceiveCachedMetadata(const char*, int /*dataLength*/) { }
         virtual void didFinishLoading(unsigned long /*identifier*/, double /*finishTime*/) { }
         virtual void didFail(const ResourceError&) { }
         virtual void didFailAccessControlCheck(const ResourceError& error) { didFail(error); }
         virtual void didFailRedirectCheck() { }
 
         virtual bool isDocumentThreadableLoaderClient() { return false; }
 
         virtual void didDownloadData(int /*dataLength*/) { }
 
         virtual ~ThreadableLoaderClient() { }
 
     protected:
         ThreadableLoaderClient() { }
     };
 
 } // namespace blink
 
 #endif // ThreadableLoaderClient_h