Create errors (especially cancellation errors) internally to WebCore, rather

Source/core/loader/DocumentLoader.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * 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. 
@@ skipping 213 matching lines @@
         bool maybeLoadEmpty();
 
         bool isMultipartReplacingLoad() const;
         bool isPostOrRedirectAfterPost(const ResourceRequest&, const ResourceResponse&);
 
         static void callContinueAfterNavigationPolicy(void*, const ResourceRequest&, PassRefPtr<FormState>, bool shouldContinue);
         void continueAfterNavigationPolicy(const ResourceRequest&, bool shouldContinue);
 
         bool shouldContinueForResponse() const;
         void stopLoadingForPolicyChange();
-        ResourceError interruptedForPolicyChangeError() const;
 
         typedef Timer<DocumentLoader> DocumentLoaderTimer;
 
         void handleSubstituteDataLoadSoon();
         void handleSubstituteDataLoadNow(DocumentLoaderTimer*);
         void startDataLoadTimer();
 
         void deliverSubstituteResourcesAfterDelay();
         void substituteResourceDeliveryTimerFired(Timer<DocumentLoader>*);
                 
@@ skipping 79 matching lines @@
 
     inline void DocumentLoader::takeMemoryCacheLoadsForClientNotification(Vector<String>& loadsSet)
     {
         loadsSet.swap(m_resourcesLoadedFromMemoryCacheForClientNotification);
         m_resourcesLoadedFromMemoryCacheForClientNotification.clear();
     }
 
 }
 
 #endif // DocumentLoader_h