Format all tests.

tests/corelib/iterable_first_test.dart

Index: tests/corelib/iterable_first_test.dart
diff --git a/tests/corelib/iterable_first_test.dart b/tests/corelib/iterable_first_test.dart
index 0ccd0368cc3399d837159ab24e66f0848286b4ce..8e3e7c8c9eb82afdf9427f1043b8d16bfb3207ea 100644
--- a/tests/corelib/iterable_first_test.dart
+++ b/tests/corelib/iterable_first_test.dart
@@ -9,9 +9,7 @@ main() {
   List<int> list2 = const <int>[4, 5];
   List<String> list3 = <String>[];
   Set<int> set1 = new Set<int>();
-  set1..add(11)
-      ..add(12)
-      ..add(13);
+  set1..add(11)..add(12)..add(13);
   Set set2 = new Set();
 
   Expect.equals(1, list1.first);