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

public/platform/WebURLError.h

Index: public/platform/WebURLError.h
diff --git a/public/platform/WebURLError.h b/public/platform/WebURLError.h
index 7ffd77245bc81a59e3d04e749c3f4d30c652db42..2fb11a98e52774d4655aae6a8c577527c17d7b3d 100644
--- a/public/platform/WebURLError.h
+++ b/public/platform/WebURLError.h
@@ -58,13 +58,18 @@ struct WebURLError {
     // 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&);