Revert "chromeos: Move files in //ash/common to //ash, part 3"

chrome/browser/ui/ash/multi_user/user_switch_util.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/ash/multi_user/user_switch_util.h"
 
+#include "ash/common/wm_shell.h"
 #include "ash/shell.h"
 #include "ash/strings/grit/ash_strings.h"
 #include "ash/system/screen_security/screen_tray_item.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/wm/overview/window_selector_controller.h"
-#include "ash/wm_shell.h"
 #include "chrome/browser/ui/simple_message_box.h"
 #include "ui/base/l10n/l10n_util.h"
 
 void TrySwitchingActiveUser(const base::Callback<void()> on_switch) {
   // Some unit tests do not have a shell. In that case simply execute.
   if (!ash::Shell::HasInstance()) {
     on_switch.Run();
     return;
   }
 
@@ skipping 20 matching lines @@
     ash::SystemTray* system_tray =
         ash::Shell::GetInstance()->GetPrimarySystemTray();
     if (system_tray->GetScreenShareItem()->is_started())
       system_tray->GetScreenShareItem()->Stop();
     if (system_tray->GetScreenCaptureItem()->is_started())
       system_tray->GetScreenCaptureItem()->Stop();
 
     on_switch.Run();
   }
 }