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

Source/core/loader/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 44 matching lines @@
     virtual ~ResourceLoader();
 
     void cancel();
     void cancel(const ResourceError&);
     void cancelIfNotFinishing();
 
     FrameLoader* frameLoader() const;
     DocumentLoader* documentLoader() const { return m_documentLoader.get(); }
     CachedResource* cachedResource() { return m_resource; }
     const ResourceRequest& originalRequest() const { return m_originalRequest; }
+
+    ResourceError cancelledError();
+    ResourceError cannotShowURLError();
     
     void setDefersLoading(bool);
     bool defersLoading() const { return m_defersLoading; }
 
     unsigned long identifier() const { return m_identifier; }
 
     void releaseResources();
 
     void didChangePriority(ResourceLoadPriority);
 
@@ skipping 63 matching lines @@
     };
 
     CachedResource* m_resource;
     ResourceLoaderState m_state;
     OwnPtr<RequestCountTracker> m_requestCountTracker;
 };
 
 }
 
 #endif