Remove a few unused typedefs.

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

Index: chrome/browser/ui/cocoa/apps/quit_with_apps_controller_mac.cc
diff --git a/chrome/browser/ui/cocoa/apps/quit_with_apps_controller_mac.cc b/chrome/browser/ui/cocoa/apps/quit_with_apps_controller_mac.cc
index 9bdb3cf42d58185394b88abff49b662d80ebbbb6..6c34598c05657f768a56fd1469543b1f225997a5 100644
--- a/chrome/browser/ui/cocoa/apps/quit_with_apps_controller_mac.cc
+++ b/chrome/browser/ui/cocoa/apps/quit_with_apps_controller_mac.cc
@@ -84,8 +84,6 @@ void QuitWithAppsController::Click() {
 }
 
 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();