Add a flag for when a navigation is ignored (e.g. by shouldOverrideUrl).

public/platform/WebURLError.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 40 matching lines @@
     int reason;
 
     // A flag showing whether or not "unreachableURL" has a copy in the
     // cache that was too stale to return for this request.
     bool staleCopyInCache;
 
     // A flag showing whether this error should be treated as a cancellation,
     // e.g. we do not show console errors for cancellations.
     bool isCancellation;
 
+    // A flag showing whether this error is the result of a request being
+    // ignored (e.g. through shouldOverrideUrlLoading).
+    bool wasIgnoredByHandler;
+
     // The url that failed to load.
     WebURL unreachableURL;
 
     // A description for the error.
     WebString localizedDescription;
 
-    WebURLError() : reason(0), staleCopyInCache(false), isCancellation(false) { }
+    WebURLError() : reason(0), staleCopyInCache(false), isCancellation(false),
+        wasIgnoredByHandler(false) { }
 
 #if INSIDE_BLINK
     BLINK_PLATFORM_EXPORT WebURLError(const ResourceError&);
     BLINK_PLATFORM_EXPORT WebURLError& operator=(const ResourceError&);
     BLINK_PLATFORM_EXPORT operator ResourceError() const;
 #endif
 };
 
 } // namespace blink
 
 #endif