remove accounts for authenticators that are uninstalled

        mSimWatcher = new SimWatcher(mContext);

        sThis.set(this);

        validateAccounts();

    }

    private void validateAccounts() {

        boolean accountDeleted = false;

        SQLiteDatabase db = mOpenHelper.getWritableDatabase();

        Cursor cursor = db.query(TABLE_ACCOUNTS,

                new String[]{ACCOUNTS_ID, ACCOUNTS_TYPE, ACCOUNTS_NAME},

                null, null, null, null, null);

        try {

            while (cursor.moveToNext()) {

                final long accountId = cursor.getLong(0);

                final String accountType = cursor.getString(1);

                final String accountName = cursor.getString(2);

                if (mAuthenticatorCache.getServiceInfo(AuthenticatorDescription.newKey(accountType))

                        == null) {

                    Log.d(TAG, "deleting account " + accountName + " because type "

                            + accountType + " no longer has a registered authenticator");

                    db.delete(TABLE_ACCOUNTS, ACCOUNTS_ID + "=" + accountId, null);

                    accountDeleted = true;

                }

            }

        } finally {

            cursor.close();

            if (accountDeleted) {

                sendAccountsChangedBroadcast();

            }

        }

    }

    public void onServiceChanged(AuthenticatorDescription desc, boolean removed) {