Update a comment to remove a reference to BrowserList::GetLastActive which was obsolete.

chrome/browser/ui/app_modal_dialogs/app_modal_dialog_queue.h

 // Copyright (c) 2011 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_APP_MODAL_DIALOGS_APP_MODAL_DIALOG_QUEUE_H_
 #define CHROME_BROWSER_UI_APP_MODAL_DIALOGS_APP_MODAL_DIALOG_QUEUE_H_
 #pragma once
 
 #include <deque>
 
 #include "chrome/browser/ui/app_modal_dialogs/app_modal_dialog.h"
 
 template <typename T> struct DefaultSingletonTraits;
 
 // Keeps a queue of AppModalDialogs, making sure only one app modal
 // dialog is shown at a time.
 // This class is a singleton.
 class AppModalDialogQueue {
  public:
   // Returns the singleton instance.
   static AppModalDialogQueue* GetInstance();
 
   // Adds a modal dialog to the queue. If there are no other dialogs in the
   // queue, the dialog will be shown immediately. Once it is shown, the
   // most recently active browser window (or whichever is currently active)
   // will be app modal, meaning it will be activated if the user tries to
-  // activate any other browser windows. So the dialog being shown should
-  // assure it is the child of BrowserList::GetLastActive() so that it is
-  // activated as well. See browser_list.h for more notes about our somewhat
-  // sloppy app modality.
+  // activate any other browser windows.
   // Note: The AppModalDialog |dialog| must be window modal before it
   // can be added as app modal.
   void AddDialog(AppModalDialog* dialog);
 
   // Removes the current dialog in the queue (the one that is being shown).
   // Shows the next dialog in the queue, if any is present. This does not
   // ensure that the currently showing dialog is closed, it just makes it no
   // longer app modal.
   void ShowNextDialog();
 
@@ skipping 50 matching lines @@
   AppModalDialog* active_dialog_;
 
   // Stores if |ShowModalDialog()| is currently being called on an app-modal
   // dialog.
   bool showing_modal_dialog_;
 
   DISALLOW_COPY_AND_ASSIGN(AppModalDialogQueue);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_MODAL_DIALOGS_APP_MODAL_DIALOG_QUEUE_H_