Remove a few unused typedefs.

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 "apps/app_window.h"
 #include "apps/app_window_registry.h"
 #include "apps/ui/native_app_window.h"
 #include "base/command_line.h"
@@ skipping 66 matching lines @@
 void QuitWithAppsController::Close(bool by_user) {
   if (by_user)
     suppress_for_session_ = true;
 }
 
 void QuitWithAppsController::Click() {
   g_browser_process->notification_ui_manager()->CancelById(id());
 }
 
 void QuitWithAppsController::ButtonClick(int button_index) {
-  typedef apps::AppWindowRegistry::AppWindowList AppWindowList;
-
   g_browser_process->notification_ui_manager()->CancelById(id());
   if (button_index == kQuitAllAppsButtonIndex) {
     apps::AppWindowRegistry::CloseAllAppWindows();
   } else if (button_index == kDontShowAgainButtonIndex) {
     g_browser_process->local_state()->SetBoolean(
         prefs::kNotifyWhenAppsKeepChromeAlive, false);
   }
 }
 
 content::WebContents* QuitWithAppsController::GetWebContents() const {
@@ skipping 42 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);
 }