Update fetch / loader classes to use OVERRIDE / FINAL when needed

Source/core/fetch/ResourceLoader.h

 /*
  * Copyright (C) 2005, 2006, 2011 Apple 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
@@ skipping 26 matching lines @@
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class Resource;
 class KURL;
 class ResourceError;
 class ResourceResponse;
 class ResourceLoaderHost;
 
-class ResourceLoader : public RefCounted<ResourceLoader>, protected blink::WebURLLoaderClient {
+class ResourceLoader FINAL : public RefCounted<ResourceLoader>, protected blink::WebURLLoaderClient {
 public:
     static PassRefPtr<ResourceLoader> create(ResourceLoaderHost*, Resource*, const ResourceRequest&, const ResourceLoaderOptions&);
     virtual ~ResourceLoader();
 
     void start();
     void changeToSynchronous();
 
     void cancel();
     void cancel(const ResourceError&);
     void cancelIfNotFinishing();
@@ skipping 76 matching lines @@
     // Used for sanity checking to make sure we don't experience illegal state
     // transitions.
     ConnectionState m_connectionState;
 
     OwnPtr<RequestCountTracker> m_requestCountTracker;
 };
 
 }
 
 #endif