Don't clear mExiting if window is going to be removed.

    void setWindowsExiting(boolean exiting) {

        for (int i = allAppWindows.size() - 1; i >= 0; i--) {

            WindowState win = allAppWindows.get(i);

            // If the app already requested to remove its window, we don't modify

            // its exiting state. Otherwise the stale window won't get removed on

            // exit and could cause focus to be given to the wrong window.

            if (!(win.mRemoveOnExit && win.mExiting)) {

                win.mExiting = exiting;

            }

        }

    }

    /**

     * Checks whether we should save surfaces for this app.