Move /fetch to use C++11

Source/core/fetch/ResourceFetcher.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
     Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
@@ skipping 100 matching lines @@
     void setImagesEnabled(bool);
 
     bool shouldDeferImageLoad(const KURL&) const;
 
     LocalFrame* frame() const; // Can be null
     FetchContext& context() const;
     Document* document() const { return m_document; } // Can be null
     void setDocument(RawPtr<Document> document) { m_document = document; }
 
     DocumentLoader* documentLoader() const { return m_documentLoader; }
-    void clearDocumentLoader() { m_documentLoader = 0; }
+    void clearDocumentLoader() { m_documentLoader = nullptr; }
 
     void garbageCollectDocumentResources();
 
     int requestCount() const { return m_requestCount; }
 
     bool isPreloaded(const String& urlString) const;
     void clearPreloads();
     void preload(Resource::Type, FetchRequest&, const String& charset);
     void printPreloadStats();
 
@@ skipping 133 matching lines @@
             m_loader->m_allowStaleResources = m_previousState;
     }
 private:
     ResourceFetcher* m_loader;
     bool m_previousState;
 };
 
 } // namespace blink
 
 #endif