Prepare for building with enable_app_list=0 on Desktop

ui/app_list/app_list_switches.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 UI_APP_LIST_APP_LIST_SWITCHES_H_
 #define UI_APP_LIST_APP_LIST_SWITCHES_H_
 
 #include "build/build_config.h"
 #include "ui/app_list/app_list_export.h"
 
 namespace app_list {
 namespace switches {
 
 // Please keep these flags sorted (but keep enable/disable pairs together).
 APP_LIST_EXPORT extern const char kCustomLauncherPage[];
 APP_LIST_EXPORT extern const char kDisableAppListDismissOnBlur[];
 APP_LIST_EXPORT extern const char kEnableAppList[];
 APP_LIST_EXPORT extern const char kEnableCenteredAppList[];
 APP_LIST_EXPORT extern const char kEnableExperimentalAppList[];
 APP_LIST_EXPORT extern const char kDisableExperimentalAppList[];
 APP_LIST_EXPORT extern const char kEnableNewAppListMixer[];
 APP_LIST_EXPORT extern const char kDisableNewAppListMixer[];
 APP_LIST_EXPORT extern const char kEnableSyncAppList[];
 APP_LIST_EXPORT extern const char kDisableSyncAppList[];
 APP_LIST_EXPORT extern const char kEnableDriveSearchInChromeLauncher[];
 APP_LIST_EXPORT extern const char kDisableDriveSearchInChromeLauncher[];
 APP_LIST_EXPORT extern const char kResetAppListInstallState[];
 
-#if defined(OS_MACOSX)
-APP_LIST_EXPORT extern const char kEnableMacViewsAppList[];
-#endif
-
 bool APP_LIST_EXPORT IsAppListSyncEnabled();
 
 bool APP_LIST_EXPORT IsFolderUIEnabled();
 
 bool APP_LIST_EXPORT IsVoiceSearchEnabled();
 
 bool APP_LIST_EXPORT IsExperimentalAppListEnabled();
 
 // Determines whether either command-line switch was given for enabling the
 // centered app list position. Do not use this when positioning the app list;
 // instead use AppListViewDelegate::ShouldCenterWindow. It checks a superset of
 // the conditions that trigger the position.
 bool APP_LIST_EXPORT IsCenteredAppListEnabled();
 
 // Determines whether the app list should not be dismissed on focus loss.
 bool APP_LIST_EXPORT ShouldNotDismissOnBlur();
 
 bool APP_LIST_EXPORT IsDriveAppsInAppListEnabled();
 
 bool APP_LIST_EXPORT IsDriveSearchInChromeLauncherEnabled();
 
-#if defined(OS_MACOSX)
-bool APP_LIST_EXPORT IsMacViewsAppListEnabled();
-#endif
-
 }  // namespace switches
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APP_LIST_SWITCHES_H_