Add error description to the DidFailProvisionalLoad callback.

chrome/browser/extensions/extension_webnavigation_api.cc

 // 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.
 
 // Implements the Chrome Extensions WebNavigation API.
 
 #include "chrome/browser/extensions/extension_webnavigation_api.h"
 
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
@@ skipping 529 matching lines @@
         is_main_frame,
         url,
         transition_type);
   }
 }
 
 void ExtensionWebNavigationTabObserver::DidFailProvisionalLoad(
     int64 frame_id,
     bool is_main_frame,
     const GURL& validated_url,
-    int error_code) {
+    int error_code,
+    const string16& error_description) {
   if (!navigation_state_.CanSendEvents(frame_id))
     return;
   navigation_state_.SetErrorOccurredInFrame(frame_id);
   DispatchOnErrorOccurred(
       tab_contents(), validated_url, frame_id, is_main_frame, error_code);
 }
 
 void ExtensionWebNavigationTabObserver::DocumentLoadedInFrame(
     int64 frame_id) {
   if (!navigation_state_.CanSendEvents(frame_id))
@@ skipping 158 matching lines @@
         keys::kFrameIdKey,
         GetFrameId(navigation_state.IsMainFrame(*frame), *frame));
     frameDict->SetBoolean(
         keys::kErrorOccurredKey,
         navigation_state.GetErrorOccurredInFrame(*frame));
     resultList->Append(frameDict);
   }
   result_.reset(resultList);
   return true;
 }