Fix the Futures tests for dart2js.

tests/corelib/futures_test.dart

Index: tests/corelib/futures_test.dart
diff --git a/tests/corelib/futures_test.dart b/tests/corelib/futures_test.dart
index c3f48fb2743c5e67c148191ba7f07d9ff6007bc0..70a54bfbb441970442a79bf2079eb1f80e411e9d 100644
--- a/tests/corelib/futures_test.dart
+++ b/tests/corelib/futures_test.dart
@@ -28,7 +28,9 @@ Future testCompleteBeforeWait() {
 }
 
 Future testForEachEmpty() {
-  return Futures.forEach([], (_) => throw 'should not be called');
+  return Futures.forEach([], (_) {
+    throw 'should not be called';
+  });
 }
 
 Future testForEach() {
@@ -45,7 +47,9 @@ Future testForEachWithException() {
     if (n == 4) throw 'correct exception';
     seen.add(n);
     return new Future.immediate(null);
-  }).transform((_) => throw 'incorrect exception').transformException((e) {
+  }).transform((_) {
+    throw 'incorrect exception';
+  }).transformException((e) {
     Expect.equals('correct exception', e);
   });
 }