Make the date_time_format_http_request_test run faster

pkg/intl/test/date_time_format_http_request_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // or details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Test date formatting and parsing using locale data read via an http request
  * to a server.
  */
 
 // TODO(alanknight): It would be nice if there were a more general facility
@@ skipping 19 matching lines @@
   // Initialize one locale just so we know what the list is.
   test('Run everything', () {
     initializeDateFormatting("en_US", url).then(expectAsync1(runEverything));});
 }
 
 void runEverything(_) {
   // Initialize all locales and wait for them to finish before running tests.
   var futures = DateFormat.allLocalesWithSymbols().map(
       (locale) => initializeDateFormatting(locale, url));
   Futures.wait(futures).then(expectAsync1((_) {
-      runDateTests();
+      runDateTests(smallSetOfLocales());
       shutDown();}));
 }
 
 void shutDown() {
   // The tiny web server knows to use this request as a cue to terminate.
   var source = '${url}terminate';
   var request = new HttpRequest.get(source, (_) {});
 }