Remove unused variable MessageListFragment.mLastMessageId to prevent from...

    // If the value >= 0, then we jump to that line. If the

    // value is maxint, then we jump to the end.

    private long mLastMessageId;

    private BackgroundQueryHandler mBackgroundQueryHandler;

    private long mThreadId;

                    mConversation.setMessageCount(0);

                    // fall through

                case DELETE_MESSAGE_TOKEN:

                    if (cookie instanceof Boolean && ((Boolean) cookie).booleanValue()) {

                        // If we just deleted the last message, reset the saved id.

                        mLastMessageId = 0;

                    }

                    // Update the notification for new messages since they may be deleted.

                    NotificationManager.update(mContext);