Correct data size argument type in resource loading path to unsigned

Source/core/loader/DocumentThreadableLoader.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013, Intel Corporation
  *
  * 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.
@@ skipping 378 matching lines @@
         if (!passesAccessControlCheck(response, effectiveAllowCredentials(), securityOrigin(), accessControlErrorDescription)) {
             notifyResponseReceived(identifier, response);
             m_client->didFailAccessControlCheck(ResourceError(errorDomainBlinkInternal, 0, response.url().string(), accessControlErrorDescription));
             return;
         }
     }
 
     m_client->didReceiveResponse(identifier, response);
 }
 
-void DocumentThreadableLoader::dataReceived(Resource* resource, const char* data, int dataLength)
+void DocumentThreadableLoader::dataReceived(Resource* resource, const char* data, unsigned dataLength)
 {
     ASSERT_UNUSED(resource, resource == this->resource());
     handleReceivedData(data, dataLength);
 }
 
-void DocumentThreadableLoader::handleReceivedData(const char* data, int dataLength)
+void DocumentThreadableLoader::handleReceivedData(const char* data, unsigned dataLength)
 {
     ASSERT(m_client);
     // Preflight data should be invisible to clients.
     if (!m_actualRequest)
         m_client->didReceiveData(data, dataLength);
 }
 
 void DocumentThreadableLoader::notifyFinished(Resource* resource)
 {
     ASSERT(m_client);
@@ skipping 151 matching lines @@
         return DoNotAllowStoredCredentials;
     return m_resourceLoaderOptions.allowCredentials;
 }
 
 SecurityOrigin* DocumentThreadableLoader::securityOrigin() const
 {
     return m_securityOrigin ? m_securityOrigin.get() : m_document.securityOrigin();
 }
 
 } // namespace blink