Correct data size argument type in resource loading path to unsigned

Source/core/loader/DocumentLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 519 matching lines @@
     m_frame->document()->maybeHandleHttpRefresh(m_response.httpHeaderField("Refresh"), Document::HttpRefreshFromHeader);
 }
 
 void DocumentLoader::commitData(const char* bytes, size_t length)
 {
     ensureWriter(m_response.mimeType());
     ASSERT(m_frame->document()->parsing());
     m_writer->addData(bytes, length);
 }
 
-void DocumentLoader::dataReceived(Resource* resource, const char* data, int length)
+void DocumentLoader::dataReceived(Resource* resource, const char* data, unsigned length)
 {
     ASSERT(data);
     ASSERT(length);
     ASSERT_UNUSED(resource, resource == m_mainResource);
     ASSERT(!m_response.isNull());
     ASSERT(!mainResourceLoader() || !mainResourceLoader()->defersLoading());
 
     // Both unloading the old page and parsing the new page may execute JavaScript which destroys the datasource
     // by starting a new load, so retain temporarily.
     RefPtrWillBeRawPtr<LocalFrame> protectFrame(m_frame);
@@ skipping 280 matching lines @@
 // This is only called by FrameLoader::replaceDocumentWhileExecutingJavaScriptURL()
 void DocumentLoader::replaceDocumentWhileExecutingJavaScriptURL(const DocumentInit& init, const String& source, Document* ownerDocument)
 {
     m_writer = createWriterFor(ownerDocument, init, mimeType(), m_writer ? m_writer->encoding() : emptyAtom, true);
     if (!source.isNull())
         m_writer->appendReplacingData(source);
     endWriting(m_writer.get());
 }
 
 } // namespace blink