[abort] [do not commit] don't stop loaders on canceled navigations

public/platform/WebURLLoaderClient.h

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 51 matching lines @@
 
     // Called when a chunk of renderer-generated metadata is received from the cache.
     virtual void didReceiveCachedMetadata(WebURLLoader*, const char* data, int dataLength) { }
 
     // Called when the load completes successfully.
     virtual void didFinishLoading(WebURLLoader*, double finishTime) { }
 
     // Called when the load completes with an error.
     virtual void didFail(WebURLLoader*, const WebURLError&) { }
 
+    virtual void didRequestStartForFrame(WebURLLoader*) { }
+
 protected:
     virtual ~WebURLLoaderClient() { }
 };
 
 } // namespace blink
 
 #endif