Don't expose DocumentWriter to embedding layer

Source/core/fetch/Resource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@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
@@ skipping 97 matching lines @@
     , m_protectorCount(0)
     , m_preloadResult(PreloadNotReferenced)
     , m_cacheLiveResourcePriority(CacheLiveResourcePriorityLow)
     , m_inLiveDecodedResourcesList(false)
     , m_requestedFromNetworkingLayer(false)
     , m_inCache(false)
     , m_loading(false)
     , m_switchingClientsToRevalidatedResource(false)
     , m_type(type)
     , m_status(Pending)
+    , m_needsSynchronousCacheHit(false)
 #ifndef NDEBUG
     , m_deleted(false)
     , m_lruIndex(0)
 #endif
     , m_nextInAllResourcesList(0)
     , m_prevInAllResourcesList(0)
     , m_nextInLiveResourcesList(0)
     , m_prevInLiveResourcesList(0)
     , m_resourceToRevalidate(0)
     , m_proxyResource(0)
@@ skipping 296 matching lines @@
             m_preloadResult = PreloadReferencedWhileComplete;
         else if (m_requestedFromNetworkingLayer)
             m_preloadResult = PreloadReferencedWhileLoading;
         else
             m_preloadResult = PreloadReferenced;
     }
     if (!hasClients() && inCache())
         memoryCache()->addToLiveResourcesSize(this);
 
     // If we have existing data to send to the new client and the resource type supprts it, send it asynchronously.
-    if (!m_response.isNull() && !m_proxyResource && !shouldSendCachedDataSynchronouslyForType(type())) {
+    if (!m_response.isNull() && !m_proxyResource && !shouldSendCachedDataSynchronouslyForType(type()) && !m_needsSynchronousCacheHit) {
         m_clientsAwaitingCallback.add(client);
         ResourceCallback::callbackHandler()->schedule(this);
         return false;
     }
 
     m_clients.add(client);
     return true;
 }
 
 void Resource::removeClient(ResourceClient* client)
@@ skipping 470 matching lines @@
         return "Shader";
     case Resource::ImportResource:
         return "ImportResource";
     }
     ASSERT_NOT_REACHED();
     return "Unknown";
 }
 #endif // !LOG_DISABLED
 
 }