Enable some passing, disabled Intl tests

test/intl/date-format/timezone.js

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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Tests time zone support.
 
-var df = Intl.DateTimeFormat();
-assertEquals(getDefaultTimeZone(), df.resolvedOptions().timeZone);
+// TODO(littledan): getDefaultTimeZone() is not available from JavaScript
+// var df = Intl.DateTimeFormat();
+// assertEquals(getDefaultTimeZone(), df.resolvedOptions().timeZone);
 
 df = Intl.DateTimeFormat(undefined, {timeZone: 'UtC'});
 assertEquals('UTC', df.resolvedOptions().timeZone);
 
 df = Intl.DateTimeFormat(undefined, {timeZone: 'gmt'});
 assertEquals('UTC', df.resolvedOptions().timeZone);
 
 df = Intl.DateTimeFormat(undefined, {timeZone: 'America/Los_Angeles'});
 assertEquals('America/Los_Angeles', df.resolvedOptions().timeZone);
 
@@ skipping 14 matching lines @@
 assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'GMT+07:00\'})');
 assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'GMT+0700\'})');
 assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'GMT-05:00\'})');
 assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'GMT-0500\'})');
 assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'Etc/GMT+0\'})');
 assertThrows('Intl.DateTimeFormat(undefined, ' +
     '{timeZone: \'America/Los-Angeles\'})');
 
 // Throws for unsupported time zones.
 assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'Aurope/Belgrade\'})');