More pre-MD cleanup

ash/common/system/tray/default_system_tray_delegate.cc

 // Copyright 2013 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 "ash/common/system/tray/default_system_tray_delegate.h"
 
 #include <string>
 
 namespace ash {
 
@@ skipping 16 matching lines @@
 }
 
 bool DefaultSystemTrayDelegate::ShouldShowSettings() const {
   return true;
 }
 
 bool DefaultSystemTrayDelegate::ShouldShowNotificationTray() const {
   return true;
 }
 
-int DefaultSystemTrayDelegate::GetSystemTrayMenuWidth() {
-  // This is the default width for English languages.
-  return 300;
-}
-
 }  // namespace ash