mash: Move user_switch_util to chrome.

ash/system/chromeos/multi_user/user_switch_util.h

Index: ash/system/chromeos/multi_user/user_switch_util.h
diff --git a/ash/system/chromeos/multi_user/user_switch_util.h b/ash/system/chromeos/multi_user/user_switch_util.h
deleted file mode 100644
index 66e0073e438d0bfe504caac650a55a5bf44e34c6..0000000000000000000000000000000000000000
--- a/ash/system/chromeos/multi_user/user_switch_util.h
+++ /dev/null
@@ -1,26 +0,0 @@
-// 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.
-
-#ifndef ASH_SYSTEM_CHROMEOS_MULTI_USER_MULTI_USER_SWITCH_UTIL_H_
-#define ASH_SYSTEM_CHROMEOS_MULTI_USER_MULTI_USER_SWITCH_UTIL_H_
-
-#include "ash/ash_export.h"
-#include "base/callback.h"
-
-namespace ash {
-
-// Tries to switch to a new user by first checking if desktop casting / sharing
-// is going on, and let the user decide if he wants to terminate it or not.
-// After terminating any desktop sharing operations, the |switch_user| function
-// will be called.
-void ASH_EXPORT
-TrySwitchingActiveUser(const base::Callback<void()> switch_user);
-
-// Terminates the "DesktopCastingWarning" dialog from a unit tests and |accept|s
-// it. False will be returned if there was no dialog shown.
-bool ASH_EXPORT TestAndTerminateDesktopCastingWarningForTest(bool accept);
-
-}  // namespace chromeos
-
-#endif  // ASH_SYSTEM_CHROMEOS_MULTI_USER_MULTI_USER_SWITCH_UTIL_H_