Format all tests.

tests/corelib_strong/iterable_last_test.dart

Index: tests/corelib_strong/iterable_last_test.dart
diff --git a/tests/corelib_strong/iterable_last_test.dart b/tests/corelib_strong/iterable_last_test.dart
index dd9f0da9db9076443241037ed0e3eb57c87533b5..482daa06ccbf56443ac63f09b42587164550f33a 100644
--- a/tests/corelib_strong/iterable_last_test.dart
+++ b/tests/corelib_strong/iterable_last_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(3, list1.last);