Change new DateTime.fromString to DateTime.parse.

tests/corelib/date_time7_test.dart

Index: tests/corelib/date_time7_test.dart
diff --git a/tests/corelib/date_time7_test.dart b/tests/corelib/date_time7_test.dart
index f9b8e943616c5db37f1fb998ce6cea84cf11e053..1be867d87bc8733551acfa4391507e0cfdf00f2c 100644
--- a/tests/corelib/date_time7_test.dart
+++ b/tests/corelib/date_time7_test.dart
@@ -5,7 +5,7 @@
 // Test DateTime timeZoneName and timeZoneOffset getters.
 
 testUtc() {
-  var d = new DateTime.fromString("2012-03-04T03:25:38.123Z");
+  var d = DateTime.parse("2012-03-04T03:25:38.123Z");
   Expect.equals("UTC", d.timeZoneName);
   Expect.equals(0, d.timeZoneOffset.inSeconds);
 }
@@ -33,11 +33,11 @@ testLocal() {
     }
   }
 
-  var d = new DateTime.fromString("2012-01-02T13:45:23");
+  var d = DateTime.parse("2012-01-02T13:45:23");
   String name = d.timeZoneName;
   checkOffset(name, d.timeZoneOffset);
 
-  d = new DateTime.fromString("2012-07-02T13:45:23");
+  d = DateTime.parse("2012-07-02T13:45:23");
   name = d.timeZoneName;
   checkOffset(name, d.timeZoneOffset);
 }