Add ScopedKeepAlive to c/b/lifetime

chrome/browser/ui/views/auto_keep_alive.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/views/auto_keep_alive.h"
-
-#include "chrome/browser/lifetime/application_lifetime.h"
-#include "chrome/browser/ui/host_desktop.h"
-
-AutoKeepAlive::AutoKeepAlive(gfx::NativeWindow window)
-    : keep_alive_available_(false) {
-  // In case of aura we want default to be keep alive not available for ash
-  // because ash has keep alive set and we don't want additional keep alive
-  // count.
-  chrome::HostDesktopType desktop_type =
-      window ? chrome::GetHostDesktopTypeForNativeWindow(window)
-             : chrome::GetActiveDesktop();
-  if (desktop_type != chrome::HOST_DESKTOP_TYPE_ASH) {
-    keep_alive_available_ = true;
-    chrome::IncrementKeepAliveCount();
-  }
-}
-
-AutoKeepAlive::~AutoKeepAlive() {
-  if (keep_alive_available_)
-    chrome::DecrementKeepAliveCount();
-}