Use a resource throttle to implement shouldOverrideUrlLoading.

content/browser/web_contents/web_contents_impl.h

 // Copyright (c) 2012 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_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 495 matching lines @@
                                const GURL& validated_url,
                                bool is_error_page,
                                bool is_iframe_srcdoc) override;
   void DidFailProvisionalLoadWithError(
       RenderFrameHostImpl* render_frame_host,
       const FrameHostMsg_DidFailProvisionalLoadWithError_Params& params)
       override;
   void DidFailLoadWithError(RenderFrameHostImpl* render_frame_host,
                             const GURL& url,
                             int error_code,
-                            const base::string16& error_description) override;
+                            const base::string16& error_description,
+                            bool was_ignored_by_handler) override;
   void DidCommitProvisionalLoad(RenderFrameHostImpl* render_frame_host,
                                 const GURL& url,
                                 ui::PageTransition transition_type) override;
   void DidNavigateMainFramePreCommit(bool navigation_is_within_page) override;
   void DidNavigateMainFramePostCommit(
       RenderFrameHostImpl* render_frame_host,
       const LoadCommittedDetails& details,
       const FrameHostMsg_DidCommitProvisionalLoad_Params& params) override;
   void DidNavigateAnyFramePostCommit(
       RenderFrameHostImpl* render_frame_host,
@@ skipping 746 matching lines @@
   // Adds/removes a callback called on creation of each new WebContents.
   static void AddCreatedCallbackForTesting(const CreatedCallback& callback);
   static void RemoveCreatedCallbackForTesting(const CreatedCallback& callback);
 
   DISALLOW_COPY_AND_ASSIGN(FriendZone);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_