[linux] Avoid crash when there's an X error during shutdown.

chrome/browser/ui/browser_list.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_BROWSER_LIST_H_
 #define CHROME_BROWSER_UI_BROWSER_LIST_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 92 matching lines @@
   // CloseAllBrowsers(true) on platforms where the application exits when no
   // more windows are remaining.  On other platforms (the Mac), this will
   // additionally exit the application.
   static void CloseAllBrowsersAndExit();
 
   // 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.
   static void CloseAllBrowsers();
 
-  // Begins shutdown of the application when the session is ending.
+  // Begins shutdown of the application when the desktop session is ending.
   static void SessionEnding();
 
   // Returns true if there is at least one Browser with the specified profile.
   static bool HasBrowserWithProfile(Profile* profile);
 
   // 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 StartKeepAlive() with matching calls to EndKeepAlive() when they no
   // longer need to keep the application running.
   static void StartKeepAlive();
@@ skipping 123 matching lines @@
   // tab index into the current Browser of the current web view
   int web_view_index_;
 
   // Current TabContents, or NULL if we're at the end of the list. This can
   // be extracted given the browser iterator and index, but it's nice to cache
   // this since the caller may access the current host many times.
   TabContents* cur_;
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_LIST_H_