Add ScopedKeepAlive to c/b/lifetime

chrome/browser/ui/views/auto_keep_alive.h

Index: chrome/browser/ui/views/auto_keep_alive.h
diff --git a/chrome/browser/ui/views/auto_keep_alive.h b/chrome/browser/ui/views/auto_keep_alive.h
deleted file mode 100644
index a9eee78e4b27245f60f34ef79524d4a395f4c521..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/views/auto_keep_alive.h
+++ /dev/null
@@ -1,23 +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 CHROME_BROWSER_UI_VIEWS_AUTO_KEEP_ALIVE_H_
-#define CHROME_BROWSER_UI_VIEWS_AUTO_KEEP_ALIVE_H_
-
-#include "base/macros.h"
-#include "ui/gfx/native_widget_types.h"
-
-// Class to scoped decrement keep alive count.
-class AutoKeepAlive {
- public:
-  explicit AutoKeepAlive(gfx::NativeWindow window);
-  ~AutoKeepAlive();
-
- private:
-  bool keep_alive_available_;
-
-  DISALLOW_COPY_AND_ASSIGN(AutoKeepAlive);
-};
-
-#endif  // CHROME_BROWSER_UI_VIEWS_AUTO_KEEP_ALIVE_H_