Cleanup: Pull some browser keep alive functions into its own file.

chrome/browser/ui/app_list/app_list_shower_views.h

 // 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_APP_LIST_APP_LIST_SHOWER_VIEWS_H_
 #define CHROME_BROWSER_UI_APP_LIST_APP_LIST_SHOWER_VIEWS_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace app_list {
 class AppListView;
 }
 
+namespace browser_lifetime {
+class ScopedKeepAlive;
+}
+
 class AppListShowerDelegate;
 class AppListShowerUnitTest;
 class Profile;
-class ScopedKeepAlive;
 
 // Creates and shows an AppList as needed for non-Ash desktops. It is owned by
 // AppListServiceViews.
 class AppListShower {
  public:
   explicit AppListShower(AppListShowerDelegate* delegate);
   virtual ~AppListShower();
 
   void ShowForCurrentProfile();
   gfx::NativeWindow GetWindow();
@@ skipping 28 matching lines @@
 
   AppListShowerDelegate* delegate_;  // Weak. Owns this.
 
   // The profile currently shown by |app_list_|.
   Profile* profile_;
 
   // The view, once created. Owned by native widget.
   app_list::AppListView* app_list_;
 
   // Used to keep the browser process alive while the app list is visible.
-  scoped_ptr<ScopedKeepAlive> keep_alive_;
+  scoped_ptr<browser_lifetime::ScopedKeepAlive> keep_alive_;
 
   bool window_icon_updated_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListShower);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_APP_LIST_SHOWER_VIEWS_H_