Refactor shutdown code to allow win/linux to run after last browser closes.

chrome/browser/browser_list_mac.mm

 // Copyright (c) 2010 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/browser_list.h"
 
 #include "chrome/browser/browser_shutdown.h"
 #import "chrome/browser/chrome_browser_application_mac.h"
 
 // static
-void BrowserList::AllBrowsersClosed() {
-  // Only terminate after all browsers are closed if trying quit.
-  if (browser_shutdown::IsTryingToQuit())
-    chrome_browser_application_mac::Terminate();
+void BrowserList::AllBrowsersClosedAndAppExiting() {
+  // Last browser is closed, so call back to controller to shutdown the app.
+  chrome_browser_application_mac::Terminate();
 }