Use a resource throttle to implement shouldOverrideUrlLoading.

content/browser/frame_host/render_frame_host_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 457 matching lines @@
   void OnOpenURL(const FrameHostMsg_OpenURL_Params& params);
   void OnDocumentOnLoadCompleted(
       FrameMsg_UILoadMetricsReportType::Value report_type,
       base::TimeTicks ui_timestamp);
   void OnDidStartProvisionalLoadForFrame(const GURL& url);
   void OnDidFailProvisionalLoadWithError(
       const FrameHostMsg_DidFailProvisionalLoadWithError_Params& params);
   void OnDidFailLoadWithError(
       const GURL& url,
       int error_code,
-      const base::string16& error_description);
+      const base::string16& error_description,
+      bool was_ignored_by_handler);
   void OnDidCommitProvisionalLoad(const IPC::Message& msg);
   void OnDidDropNavigation();
   void OnBeforeUnloadACK(
       bool proceed,
       const base::TimeTicks& renderer_before_unload_start_time,
       const base::TimeTicks& renderer_before_unload_end_time);
   void OnSwapOutACK();
   void OnRenderProcessGone(int status, int error_code);
   void OnContextMenu(const ContextMenuParams& params);
   void OnJavaScriptExecuteResponse(int id, const base::ListValue& result);
@@ skipping 234 matching lines @@
 
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_