Merge "Treat "GMT" persist.sys.timezone as unset."

     */

    private static void setTimezoneFromMccIfNeeded(Context context, int mcc) {

        String timezone = SystemProperties.get(ServiceStateTracker.TIMEZONE_PROPERTY);

        if (timezone == null || timezone.length() == 0) {

        // timezone.equals("GMT") will be true and only true if the timezone was

        // set to a default value by the system server (when starting, system server.

        // sets the persist.sys.timezone to "GMT" if it's not set)."GMT" is not used by

        // any code that sets it explicitly (in case where something sets GMT explicitly,

        // "Etc/GMT" Olsen ID would be used).

        // TODO(b/64056758): Remove "timezone.equals("GMT")" hack when there's a

        // better way of telling if the value has been defaulted.

        if (timezone == null || timezone.length() == 0 || timezone.equals("GMT")) {

            String zoneId = defaultTimeZoneForMcc(mcc);

            if (zoneId != null && zoneId.length() > 0) {

                // Set time zone based on MCC