Add error description to the DidFailProvisionalLoad callback.

content/renderer/mock_content_renderer_client.h

 // Copyright (c) 2011 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_RENDERER_MOCK_CONTENT_RENDERER_CLIENT_H_
 #define CONTENT_RENDERER_MOCK_CONTENT_RENDERER_CLIENT_H_
 #pragma once
 
 #include <string>
 
@@ skipping 15 matching lines @@
       RenderView* render_view,
       WebKit::WebFrame* frame,
       const WebKit::WebPluginParams& params,
       WebKit::WebPlugin** plugin) OVERRIDE;
   virtual void ShowErrorPage(RenderView* render_view,
                              WebKit::WebFrame* frame,
                              int http_status_code) OVERRIDE;
   virtual std::string GetNavigationErrorHtml(
       const WebKit::WebURLRequest& failed_request,
       const WebKit::WebURLError& error) OVERRIDE;
+  virtual string16 GetNavigationErrorDescription(
+      const WebKit::WebURLRequest& failed_request,
+      const WebKit::WebURLError& error) OVERRIDE;
   virtual bool RunIdleHandlerWhenWidgetsHidden() OVERRIDE;
   virtual bool AllowPopup(const GURL& creator) OVERRIDE;
   virtual bool ShouldFork(WebKit::WebFrame* frame,
                           const GURL& url,
                           bool is_content_initiated,
                           bool is_initial_navigation,
                           bool* send_referrer) OVERRIDE;
   virtual bool WillSendRequest(WebKit::WebFrame* frame,
                                const GURL& url,
                                GURL* new_url) OVERRIDE;
@@ skipping 18 matching lines @@
   virtual bool HandleSetCookieRequest(RenderView* sender,
                                       const GURL& url,
                                       const GURL& first_party_for_cookies,
                                       const std::string& value) OVERRIDE;
   virtual bool IsProtocolSupportedForMedia(const GURL& url) OVERRIDE;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MOCK_CONTENT_RENDERER_CLIENT_H_