Implement Keychain reauthorization

chrome/browser/mac/keychain_reauthorize.h

Index: chrome/browser/mac/keychain_reauthorize.h
===================================================================
--- chrome/browser/mac/keychain_reauthorize.h	(revision 0)
+++ chrome/browser/mac/keychain_reauthorize.h	(revision 0)
@@ -0,0 +1,19 @@
+// Copyright (c) 2012 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_MAC_KEYCHAIN_REAUTHORIZE_H_
+#define CHROME_BROWSER_MAC_KEYCHAIN_REAUTHORIZE_H_
+#pragma once
+
+namespace chrome {
+namespace browser {
+namespace mac {
+
+void KeychainReauthorize();
+
+}  // namespace mac
+}  // namespace browser
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_MAC_KEYCHAIN_REAUTHORIZE_H_