Mac: reform our shutdown routine.

chrome/browser/browser_list.cc

 // Copyright (c) 2009 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 "base/histogram.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "build/build_config.h"
@@ skipping 235 matching lines @@
   NotificationService::current()->Notify(
       NotificationType::APP_EXITING,
       NotificationService::AllSources(),
       NotificationService::NoDetails());
 
 #if !defined(OS_MACOSX)
   // On most platforms, closing all windows causes the application to exit.
   CloseAllBrowsers(true);
 #else
   // On the Mac, the application continues to run once all windows are closed.
-  // Terminate will result in a CloseAllBrowsers(true) call, and additionally,
-  // will cause the application to exit cleanly.
+  // Terminate will result in a CloseAllBrowsers(true) call, and once (and if)
+  // that is done, will cause the application to exit cleanly.
   chrome_browser_application_mac::Terminate();
 #endif
 }
 
 // static
 void BrowserList::WindowsSessionEnding() {
   // EndSession is invoked once per frame. Only do something the first time.
   static bool already_ended = false;
   if (already_ended)
     return;
@@ skipping 161 matching lines @@
     }
 
     TabContents* next_tab =
         (*browser_iterator_)->GetTabContentsAt(web_view_index_);
     if (next_tab) {
       cur_ = next_tab;
       return;
     }
   }
 }