Correct data size argument type in resource loading path to unsigned

Source/core/loader/WorkerLoaderClientBridgeSyncHelper.cpp

 /*
  * Copyright (C) 2014 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 61 matching lines @@
     OwnPtr<ResourceResponse> response(ResourceResponse::adopt(responseData));
     client->didReceiveResponse(identifier, *response);
 }
 
 void WorkerLoaderClientBridgeSyncHelper::didReceiveResponse(unsigned long identifier, const ResourceResponse& response)
 {
     ASSERT(isMainThread());
     m_clientTasks.append(bind(&didReceiveResponseAdapter, &m_client, identifier, response.copyData()));
 }
 
-void WorkerLoaderClientBridgeSyncHelper::didReceiveData(const char* data, int dataLength)
+void WorkerLoaderClientBridgeSyncHelper::didReceiveData(const char* data, unsigned dataLength)
 {
     ASSERT(isMainThread());
     Vector<char>* buffer = new Vector<char>(dataLength);
     memcpy(buffer->data(), data, dataLength);
     m_receivedData.append(buffer);
     m_clientTasks.append(bind(&ThreadableLoaderClient::didReceiveData, &m_client, static_cast<const char*>(buffer->data()), dataLength));
 }
 
 void WorkerLoaderClientBridgeSyncHelper::didDownloadData(int dataLength)
 {
@@ skipping 44 matching lines @@
 
 WorkerLoaderClientBridgeSyncHelper::WorkerLoaderClientBridgeSyncHelper(ThreadableLoaderClient& client, PassOwnPtr<blink::WebWaitableEvent> event)
     : m_done(false)
     , m_client(client)
     , m_event(event)
 {
     ASSERT(m_event);
 }
 
 } // namespace blink