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

chrome/browser/guest_view/app_view/chrome_app_view_guest_delegate.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/apps/scoped_keep_alive.h"
 #include "chrome/browser/guest_view/app_view/chrome_app_view_guest_delegate.h"
+#include "chrome/browser/lifetime/browser_keep_alive.h"
 #include "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 #include "chrome/browser/ui/apps/chrome_app_delegate.h"
 #include "components/renderer_context_menu/context_menu_delegate.h"
 
 namespace extensions {
 
 ChromeAppViewGuestDelegate::ChromeAppViewGuestDelegate() {
 }
 
 ChromeAppViewGuestDelegate::~ChromeAppViewGuestDelegate() {
 }
 
 bool ChromeAppViewGuestDelegate::HandleContextMenu(
     content::WebContents* web_contents,
     const content::ContextMenuParams& params) {
   ContextMenuDelegate* menu_delegate =
       ContextMenuDelegate::FromWebContents(web_contents);
   DCHECK(menu_delegate);
 
   scoped_ptr<RenderViewContextMenuBase> menu =
       menu_delegate->BuildMenu(web_contents, params);
   menu_delegate->ShowMenu(menu.Pass());
   return true;
 }
 
 AppDelegate* ChromeAppViewGuestDelegate::CreateAppDelegate() {
-  return new ChromeAppDelegate(make_scoped_ptr(new ScopedKeepAlive));
+  return new ChromeAppDelegate(
+      make_scoped_ptr(new browser_lifetime::ScopedKeepAlive));
 }
 
 }  // namespace extensions