Remove the OnError method from notification delegates.

chrome/browser/ui/cocoa/apps/quit_with_apps_controller_mac.cc

 // Copyright 2014 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 "chrome/browser/ui/cocoa/apps/quit_with_apps_controller_mac.h"
 
 #include "base/command_line.h"
 #include "base/i18n/number_formatting.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
@@ skipping 54 matching lines @@
       l10n_util::GetStringUTF16(IDS_QUIT_WITH_APPS_NOTIFICATION_DISPLAY_SOURCE),
       replace_id,
       rich_notification_data,
       this));
 }
 
 QuitWithAppsController::~QuitWithAppsController() {}
 
 void QuitWithAppsController::Display() {}
 
-void QuitWithAppsController::Error() {}
-
 void QuitWithAppsController::Close(bool by_user) {
   if (by_user)
     suppress_for_session_ = true;
 }
 
 void QuitWithAppsController::Click() {
   g_browser_process->notification_ui_manager()->CancelById(
       id(), NotificationUIManager::GetProfileID(notification_profile_));
 }
 
@@ skipping 56 matching lines @@
 
   // Always return false, the notification UI can be used to quit all apps which
   // will cause Chrome to quit.
   return false;
 }
 
 // static
 void QuitWithAppsController::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterBooleanPref(prefs::kNotifyWhenAppsKeepChromeAlive, true);
 }