Migrate test block 7 to Dart 2.0.

tests/corelib_2/duration2_test.dart

Index: tests/corelib_2/duration2_test.dart
diff --git a/tests/corelib_strong/duration2_test.dart b/tests/corelib_2/duration2_test.dart
similarity index 66%
rename from tests/corelib_strong/duration2_test.dart
rename to tests/corelib_2/duration2_test.dart
index 7bfebb09b7a518da4441661eb2cebb2b7bf257de..534b6557a0bd5c8d9c97488b0f36f16543767d59 100644
--- a/tests/corelib_strong/duration2_test.dart
+++ b/tests/corelib_2/duration2_test.dart
@@ -12,16 +12,16 @@ main() {
   // See dartbug.com/22309
 
   String longString = "str" * 1000;
-  Expect.throws(() => new Duration(days: longString),
+  Expect.throws(() => new Duration(/*@compile-error=unspecified*/days: longString),
       (e) => e is ArgumentError || e is TypeError || e is NoSuchMethodError);
-  Expect.throws(() => new Duration(hours: longString),
+  Expect.throws(() => new Duration(/*@compile-error=unspecified*/hours: longString),
       (e) => e is ArgumentError || e is TypeError || e is NoSuchMethodError);
-  Expect.throws(() => new Duration(minutes: longString),
+  Expect.throws(() => new Duration(/*@compile-error=unspecified*/minutes: longString),
       (e) => e is ArgumentError || e is TypeError || e is NoSuchMethodError);
-  Expect.throws(() => new Duration(seconds: longString),
+  Expect.throws(() => new Duration(/*@compile-error=unspecified*/seconds: longString),
       (e) => e is ArgumentError || e is TypeError || e is NoSuchMethodError);
-  Expect.throws(() => new Duration(milliseconds: longString),
+  Expect.throws(() => new Duration(/*@compile-error=unspecified*/milliseconds: longString),
       (e) => e is ArgumentError || e is TypeError || e is NoSuchMethodError);
-  Expect.throws(() => new Duration(microseconds: longString),
+  Expect.throws(() => new Duration(/*@compile-error=unspecified*/microseconds: longString),
       (e) => e is ArgumentError || e is TypeError || e is NoSuchMethodError);
 }