Sign out profile when local_state file has been changed.

chrome/browser/signin/signin_util.h

+// Copyright 2016 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_SIGNIN_SIGNIN_UTIL_H_
+#define CHROME_BROWSER_SIGNIN_SIGNIN_UTIL_H_
+
+namespace signin_util {
+
+// Return whether the force sign in policy is enabled or not.
+// The state of this policy will not be changed without relaunch Chrome.
+bool IsForceSigninEnabled();
+
+// Enable or disable force sign in for testing.
+void SetForceSigninForTesting(bool enable);
+
+}  // namespace signin_util
+
+#endif  // CHROME_BROWSER_SIGNIN_SIGNIN_UTIL_H_