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

chrome/browser/app_controller_mac.h

 // 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_APP_CONTROLLER_MAC_H_
 #define CHROME_BROWSER_APP_CONTROLLER_MAC_H_
 
 #if defined(__OBJC__)
 
 #import <Cocoa/Cocoa.h>
@@ skipping 12 matching lines @@
 class BookmarkMenuBridge;
 class CommandUpdater;
 class GURL;
 class HandoffActiveURLObserverBridge;
 @class HandoffManager;
 class HistoryMenuBridge;
 class Profile;
 @class ProfileMenuController;
 class QuitWithAppsController;
 
+namespace browser_lifetime {
+class ScopedKeepAlive;
+}
+
 namespace ui {
 class WorkAreaWatcherObserver;
 }
 
 // The application controller object, created by loading the MainMenu nib.
 // This handles things like responding to menus when there are no windows
 // open, etc and acts as the NSApplication delegate.
 @interface AppController : NSObject<NSUserInterfaceValidations,
                                     NSMenuDelegate,
                                     NSApplicationDelegate> {
@@ skipping 42 matching lines @@
   // to it.
   IBOutlet NSMenu* helpMenu_;
 
   // If we are expecting a workspace change in response to a reopen
   // event, the time we got the event. A null time otherwise.
   base::TimeTicks reopenTime_;
 
   // Observers that listen to the work area changes.
   base::ObserverList<ui::WorkAreaWatcherObserver> workAreaChangeObservers_;
 
+  // Object to keep the browser alive when there are no windows open.
+  scoped_ptr<browser_lifetime::ScopedKeepAlive> keep_alive_;
+
   scoped_ptr<PrefChangeRegistrar> profilePrefRegistrar_;
   PrefChangeRegistrar localPrefRegistrar_;
 
   // Displays a notification when quitting while apps are running.
   scoped_refptr<QuitWithAppsController> quitWithAppsController_;
 
   // Responsible for maintaining all state related to the Handoff feature.
   base::scoped_nsobject<HandoffManager> handoffManager_;
 
   // Observes changes to the active URL.
@@ skipping 73 matching lines @@
 
 namespace app_controller_mac {
 
 // True if we are currently handling an IDC_NEW_{TAB,WINDOW} command. Used in
 // SessionService::Observe() to get around windows/linux and mac having
 // different models of application lifetime.
 bool IsOpeningNewWindow();
 
 }  // namespace app_controller_mac
 
-#endif
+#endif  // CHROME_BROWSER_APP_CONTROLLER_MAC_H_