Use a resource throttle to implement shouldOverrideUrlLoading.

content/browser/web_contents/web_contents_impl.cc

 // 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.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 2577 matching lines @@
 
 void WebContentsImpl::DidFailProvisionalLoadWithError(
     RenderFrameHostImpl* render_frame_host,
     const FrameHostMsg_DidFailProvisionalLoadWithError_Params& params) {
   GURL validated_url(params.url);
   FOR_EACH_OBSERVER(WebContentsObserver,
                     observers_,
                     DidFailProvisionalLoad(render_frame_host,
                                            validated_url,
                                            params.error_code,
-                                           params.error_description));
+                                           params.error_description,
+                                           params.was_ignored_by_handler));
 
   FrameTreeNode* ftn = render_frame_host->frame_tree_node();
   BrowserAccessibilityManager* manager =
       ftn->current_frame_host()->browser_accessibility_manager();
   if (manager)
     manager->NavigationFailed();
 }
 
 void WebContentsImpl::DidFailLoadWithError(
     RenderFrameHostImpl* render_frame_host,
     const GURL& url,
     int error_code,
-    const base::string16& error_description) {
+    const base::string16& error_description,
+    bool was_ignored_by_handler) {
   FOR_EACH_OBSERVER(
       WebContentsObserver,
       observers_,
-      DidFailLoad(render_frame_host, url, error_code, error_description));
+      DidFailLoad(render_frame_host, url, error_code, error_description,
+        was_ignored_by_handler));
 }
 
 void WebContentsImpl::NotifyChangedNavigationState(
     InvalidateTypes changed_flags) {
   NotifyNavigationStateChanged(changed_flags);
 }
 
 void WebContentsImpl::AboutToNavigateRenderFrame(
       RenderFrameHostImpl* old_host,
       RenderFrameHostImpl* new_host) {
@@ skipping 1766 matching lines @@
   player_map->erase(it);
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content