Remove notifications for account when account is removed.

        if (account == null) throw new IllegalArgumentException("account is null");

        checkManageAccountsPermission();

        long identityToken = clearCallingIdentity();

        cancelNotification(getSigninRequiredNotificationId(account));

        synchronized(mCredentialsPermissionNotificationIds) {

            for (Pair<Pair<Account, String>, Integer> pair:

                mCredentialsPermissionNotificationIds.keySet()) {

                if (account.equals(pair.first.first)) {

                    int id = mCredentialsPermissionNotificationIds.get(pair);

                    cancelNotification(id);

                }

            }

        }

        try {

            new RemoveAccountSession(response, account).bind();

        } finally {