Use a resource throttle to implement shouldOverrideUrlLoading.

content/browser/frame_host/navigator_impl.cc

 // 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.
 
 #include "content/browser/frame_host/navigator_impl.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 224 matching lines @@
   }
 
   if (delegate_)
     delegate_->DidFailProvisionalLoadWithError(render_frame_host, params);
 }
 
 void NavigatorImpl::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) {
   if (delegate_) {
     delegate_->DidFailLoadWithError(
         render_frame_host, url, error_code,
-        error_description);
+        error_description, was_ignored_by_handler);
   }
 }
 
 bool NavigatorImpl::NavigateToEntry(
     FrameTreeNode* frame_tree_node,
     const NavigationEntryImpl& entry,
     NavigationController::ReloadType reload_type) {
   TRACE_EVENT0("browser,navigation", "NavigatorImpl::NavigateToEntry");
 
   // The renderer will reject IPC messages with URLs longer than
@@ skipping 632 matching lines @@
         "Navigation.TimeToCommit_ExistingRenderer_BeforeUnloadDiscounted",
         time_to_commit);
     UMA_HISTOGRAM_TIMES(
         "Navigation.TimeToURLJobStart_ExistingRenderer_BeforeUnloadDiscounted",
         time_to_network);
   }
   navigation_data_.reset();
 }
 
 }  // namespace content