Correct data size argument type in resource loading path to unsigned

Source/core/loader/ThreadableLoaderClientWrapper.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 51 matching lines @@
         if (m_client)
             m_client->didSendData(bytesSent, totalBytesToBeSent);
     }
 
     void didReceiveResponse(unsigned long identifier, const ResourceResponse& response)
     {
         if (m_client)
             m_client->didReceiveResponse(identifier, response);
     }
 
-    void didReceiveData(const char* data, int dataLength)
+    void didReceiveData(const char* data, unsigned dataLength)
     {
         if (m_client)
             m_client->didReceiveData(data, dataLength);
     }
 
     void didReceiveCachedMetadata(const char* data, int dataLength)
     {
         if (m_client)
             m_client->didReceiveCachedMetadata(data, dataLength);
     }
@@ skipping 48 matching lines @@
     {
     }
 
     ThreadableLoaderClient* m_client;
     bool m_done;
 };
 
 } // namespace blink
 
 #endif // ThreadableLoaderClientWrapper_h