Correct data size argument type in resource loading path to unsigned

Source/core/fetch/RawResource.cpp

 /*
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 20 matching lines @@
 #include "core/fetch/ResourceLoader.h"
 #include "platform/SharedBuffer.h"
 
 namespace blink {
 
 RawResource::RawResource(const ResourceRequest& resourceRequest, Type type)
     : Resource(resourceRequest, type)
 {
 }
 
-void RawResource::appendData(const char* data, int length)
+void RawResource::appendData(const char* data, unsigned length)
 {
     Resource::appendData(data, length);
 
     ResourcePtr<RawResource> protect(this);
     ResourceClientWalker<RawResourceClient> w(m_clients);
     while (RawResourceClient* c = w.next())
         c->dataReceived(this, data, length);
 }
 
 void RawResource::didAddClient(ResourceClient* c)
@@ skipping 132 matching lines @@
     for (HTTPHeaderMap::const_iterator i = oldHeaders.begin(); i != end; ++i) {
         AtomicString headerName = i->key;
         if (!shouldIgnoreHeaderForCacheReuse(headerName) && i->value != newHeaders.get(headerName))
             return false;
     }
 
     return true;
 }
 
 } // namespace blink