Update entry page type to include error pages when appropriate.

chrome/browser/extensions/api/web_navigation/web_navigation_api.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.
 
 // Implements the Chrome Extensions WebNavigation API.
 
 #include "chrome/browser/extensions/api/web_navigation/web_navigation_api.h"
 
 #include "base/lazy_instance.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 349 matching lines @@
 
   helpers::DispatchOnBeforeNavigate(
       web_contents(),
       render_frame_host,
       navigation_state_.GetUrl(render_frame_host));
 }
 
 void WebNavigationTabObserver::DidCommitProvisionalLoadForFrame(
     content::RenderFrameHost* render_frame_host,
     const GURL& url,
+    bool url_is_unreachable,
     ui::PageTransition transition_type) {
   content::RenderViewHost* render_view_host =
       render_frame_host->GetRenderViewHost();
   DVLOG(2) << "DidCommitProvisionalLoad("
            << "render_view_host=" << render_view_host
            << ", frame_num=" << render_frame_host->GetRoutingID()
            << ", url=" << url << ")";
   if (render_view_host != render_view_host_ &&
       render_view_host != pending_render_view_host_)
     return;
@@ skipping 390 matching lines @@
   return g_factory.Pointer();
 }
 
 void WebNavigationAPI::OnListenerAdded(const EventListenerInfo& details) {
   web_navigation_event_router_.reset(new WebNavigationEventRouter(
       Profile::FromBrowserContext(browser_context_)));
   EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 }  // namespace extensions