win/aura: Remove some more non-aura code for Windows.

chrome/browser/metro_utils/metro_chrome_win.h

 // 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.
 
 #ifndef CHROME_BROWSER_METRO_UTILS_METRO_CHROME_WIN_H_
 #define CHROME_BROWSER_METRO_UTILS_METRO_CHROME_WIN_H_
 
 #include "chrome/browser/ui/host_desktop.h"
 
 namespace chrome {
 
 // Using IApplicationActivationManager::ActivateApplication, activate the
 // Chrome window running in Metro mode. Returns true if the activation was
 // successful. Note that this can not be called nested in another COM
 // SendMessage (results in error RPC_E_CANTCALLOUT_ININPUTSYNCCALL), so use
 // PostTask to handle that case.
 bool ActivateMetroChrome();
 
 enum Win8Environment {
-  WIN_8_ENVIRONMENT_METRO,
-  WIN_8_ENVIRONMENT_DESKTOP,
   WIN_8_ENVIRONMENT_METRO_AURA,
   WIN_8_ENVIRONMENT_DESKTOP_AURA,
   WIN_8_ENVIRONMENT_MAX
 };
 
 Win8Environment GetWin8Environment(HostDesktopType desktop);
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_METRO_UTILS_METRO_CHROME_WIN_H_