[DevTools] Log failed XHR requests.

Source/core/inspector/InspectorInstrumentation.idl

 /*
 * Copyright (C) 2013 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 261 matching lines @@
     [Resource]
     void willDispachEventSourceEvent(ExecutionContext*, ThreadableLoaderClient* eventSource, const AtomicString& eventName, const AtomicString& eventId, const Vector<UChar>& data);
 
     [Resource]
     void didFinishEventSourceRequest(ExecutionContext*, ThreadableLoaderClient* eventSource);
 
     [AsyncCallTracker, Resource]
     void willLoadXHR(ExecutionContext*, XMLHttpRequest* xhr, ThreadableLoaderClient* client, const AtomicString& method, const KURL& url, bool async, PassRefPtr<FormData>, const HTTPHeaderMap& headers, bool includeCredentials);
 
     [Resource]
-    void didFailXHRLoading(ExecutionContext*, XMLHttpRequest* xhr, ThreadableLoaderClient* client);
+    void didFailXHRLoading([Keep] ExecutionContext*, XMLHttpRequest* xhr, ThreadableLoaderClient* client, const AtomicString& method, const String& url);
 
     [Resource]
-    void didFinishXHRLoading([Keep] ExecutionContext*, XMLHttpRequest* xhr, ThreadableLoaderClient* client, unsigned long identifier, ScriptString sourceString, const AtomicString& method, const String& url);
+    void didFinishXHRLoading([Keep] ExecutionContext*, XMLHttpRequest* xhr, ThreadableLoaderClient* client, const AtomicString& method, const String& url);
 
     [Resource]
     void scriptImported(ExecutionContext*, unsigned long identifier, const String& sourceString);
 
     [Debugger]
     void scriptExecutionBlockedByCSP(ExecutionContext*, const String& directiveText);
 
     [Resource]
     void didReceiveScriptResponse(ExecutionContext*, unsigned long identifier);
 
@@ skipping 152 matching lines @@
 interface InspectorOverrides {
     [CSS, Inline=FastReturn]
     bool forcePseudoState([Keep] Element* element, CSSSelector::PseudoType pseudoState);
 
     [Worker, Inline=FastReturn]
     bool shouldPauseDedicatedWorkerOnStart(ExecutionContext* context);
 
     [Resource, Inline=FastReturn]
     bool shouldForceCORSPreflight(Document*);
 }