Update the ResourceRequest in DocumentLoader after the embedder modified it

Source/core/fetch/Resource.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
 
     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 169 matching lines @@
     void setCacheLiveResourcePriority(CacheLiveResourcePriority);
     unsigned cacheLiveResourcePriority() const { return m_cacheLiveResourcePriority; }
     bool inLiveDecodedResourcesList() { return m_inLiveDecodedResourcesList; }
 
     void clearLoader();
 
     SharedBuffer* resourceBuffer() const { ASSERT(!m_purgeableData); return m_data.get(); }
     void setResourceBuffer(PassRefPtr<SharedBuffer>);
 
     virtual void willSendRequest(ResourceRequest&, const ResourceResponse&) { m_requestedFromNetworkingLayer = true; }
+    virtual void updateRequest(const ResourceRequest&) { }
     virtual void responseReceived(const ResourceResponse&);
     void setResponse(const ResourceResponse& response) { m_response = response; }
     const ResourceResponse& response() const { return m_response; }
 
     // Sets the serialized metadata retrieved from the platform's cache.
     void setSerializedCachedMetadata(const char*, size_t);
 
     // Caches the given metadata in association with this resource and suggests
     // that the platform persist it. The dataTypeID is a pseudo-randomly chosen
     // identifier that is used to distinguish data generated by the caller.
@@ skipping 196 matching lines @@
 const char* ResourceTypeName(Resource::Type);
 #endif
 
 #define DEFINE_RESOURCE_TYPE_CASTS(typeName) \
     DEFINE_TYPE_CASTS(typeName##Resource, Resource, resource, resource->type() == Resource::typeName, resource.type() == Resource::typeName); \
     inline typeName##Resource* to##typeName##Resource(const ResourcePtr<Resource>& ptr) { return to##typeName##Resource(ptr.get()); }
 
 }
 
 #endif