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

chrome/browser/lifetime/application_lifetime.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_LIFETIME_APPLICATION_LIFETIME_H_
 #define CHROME_BROWSER_LIFETIME_APPLICATION_LIFETIME_H_
 
 #include "base/compiler_specific.h"
 
 class Browser;
@@ skipping 64 matching lines @@
 
 // Closes all browsers. If the session is ending the windows are closed
 // directly. Otherwise the windows are closed by way of posting a WM_CLOSE
 // message. This will quit the application if there is nothing other than
 // browser windows keeping it alive or the application is quitting.
 void CloseAllBrowsers();
 
 // Begins shutdown of the application when the desktop session is ending.
 void SessionEnding();
 
-// Tells the BrowserList to keep the application alive after the last Browser
-// closes. This is implemented as a count, so callers should pair their calls
-// to IncrementKeepAliveCount() with matching calls to DecrementKeepAliveCount()
-// when they no
-// longer need to keep the application running.
-void IncrementKeepAliveCount();
-
-// Stops keeping the application alive after the last Browser is closed.
-// Should match a previous call to IncrementKeepAliveCount().
-void DecrementKeepAliveCount();
-
-// Returns true if application will continue running after the last Browser
-// closes.
-bool WillKeepAlive();
-
 // Emits APP_TERMINATING notification. It is guaranteed that the
 // notification is sent only once.
 void NotifyAppTerminating();
 
 // Send out notifications.
 // For ChromeOS, also request session manager to end the session.
 void NotifyAndTerminate(bool fast_path);
 
 // Called once the application is exiting.
 void OnAppExiting();
 
 // Called once the application is exiting to do any platform specific
 // processing required.
 void HandleAppExitingForPlatform();
 
 // Returns true if we can start the shutdown sequence for the browser, i.e. the
 // last browser window is being closed.
 bool ShouldStartShutdown(Browser* browser);
 
-// Disable browser shutdown for unit tests.
-void DisableShutdownForTesting(bool disable_shutdown_for_testing);
-
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_LIFETIME_APPLICATION_LIFETIME_H_