Add error description to the DidFailProvisionalLoad callback.

chrome/browser/extensions/extension_webnavigation_api.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.
 
 // Defines the Chrome Extensions WebNavigation API functions for observing and
 // intercepting navigation events, as specified in
 // chrome/common/extensions/api/extension_api.json.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_
@@ skipping 124 matching lines @@
       int64 frame_id,
       bool is_main_frame,
       const GURL& validated_url,
       bool is_error_page,
       RenderViewHost* render_view_host) OVERRIDE;
   virtual void DidCommitProvisionalLoadForFrame(
       int64 frame_id,
       bool is_main_frame,
       const GURL& url,
       PageTransition::Type transition_type) OVERRIDE;
-  virtual void DidFailProvisionalLoad(int64 frame_id,
-                                      bool is_main_frame,
-                                      const GURL& validated_url,
-                                      int error_code) OVERRIDE;
+  virtual void DidFailProvisionalLoad(
+      int64 frame_id,
+      bool is_main_frame,
+      const GURL& validated_url,
+      int error_code,
+      const string16& error_description) OVERRIDE;
   virtual void DocumentLoadedInFrame(int64 frame_id) OVERRIDE;
   virtual void DidFinishLoad(int64 frame_id) OVERRIDE;
   virtual void DidOpenRequestedURL(TabContents* new_contents,
                                    const GURL& url,
                                    const GURL& referrer,
                                    WindowOpenDisposition disposition,
                                    PageTransition::Type transition,
                                    int64 source_frame_id) OVERRIDE;
   virtual void TabContentsDestroyed(TabContents* tab) OVERRIDE;
 
@@ skipping 76 matching lines @@
 };
 
 // API function that returns the states of all frames in a given tab.
 class GetAllFramesFunction : public SyncExtensionFunction {
   virtual ~GetAllFramesFunction() {}
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("webNavigation.getAllFrames")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBNAVIGATION_API_H_