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

chrome/browser/background/background_mode_manager.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_BACKGROUND_BACKGROUND_MODE_MANAGER_H_
 #define CHROME_BROWSER_BACKGROUND_BACKGROUND_MODE_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 18 matching lines @@
 class PrefRegistrySimple;
 class Profile;
 class ProfileInfoCache;
 class StatusIcon;
 class StatusTray;
 
 namespace base {
 class CommandLine;
 }
 
+namespace browser_lifetime {
+class ScopedKeepAlive;
+}
+
 typedef std::vector<base::Closure> CommandIdHandlerVector;
 
 // BackgroundModeManager is responsible for switching Chrome into and out of
 // "background mode" and for providing UI for the user to exit Chrome when there
 // are no open browser windows.
 //
 // Chrome enters background mode whenever there is an application with the
 // "background" permission installed, or a "trigger" that requires Chrome to be
 // running. This class monitors the set of installed/loaded extensions to ensure
 // that Chrome enters/exits background mode at the appropriate time.
@@ skipping 357 matching lines @@
 
   // Reference to our status icon's context menu (if any) - owned by the
   // status_icon_.
   StatusIconMenuModel* context_menu_;
 
   // Set to true when we are running in background mode. Allows us to track our
   // current background state so we can take the appropriate action when the
   // user disables/enables background mode via preferences.
   bool in_background_mode_;
 
-  // Set when we are keeping chrome running during the startup process - this
+  // Set when we are keeping Chrome running during the startup process - this
   // is required when running with the --no-startup-window flag, as otherwise
   // chrome would immediately exit due to having no open windows.
-  bool keep_alive_for_startup_;
+  scoped_ptr<browser_lifetime::ScopedKeepAlive> keep_alive_for_startup_;
 
   // Set to true when Chrome is running with the --keep-alive-for-test flag
   // (used for testing background mode without having to install a background
   // app).
   bool keep_alive_for_test_;
 
   // Set to true when background mode is suspended.
   bool background_mode_suspended_;
 
   // Set to true when background mode is keeping Chrome alive.
-  bool keeping_alive_;
+  scoped_ptr<browser_lifetime::ScopedKeepAlive> keep_alive_for_background_mode_;
 
   base::WeakPtrFactory<BackgroundModeManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundModeManager);
 };
 
 #endif  // CHROME_BROWSER_BACKGROUND_BACKGROUND_MODE_MANAGER_H_