Format all tests.

tests/corelib_strong/map_contains_key_test.dart

Index: tests/corelib_strong/map_contains_key_test.dart
diff --git a/tests/corelib_strong/map_contains_key_test.dart b/tests/corelib_strong/map_contains_key_test.dart
index 32fd3db4c147830435328152a60fd7d338fa49d9..d597a991672c6bf063f9c7b7ec58c4d0560aff32 100644
--- a/tests/corelib_strong/map_contains_key_test.dart
+++ b/tests/corelib_strong/map_contains_key_test.dart
@@ -4,14 +4,19 @@
 
 import "package:expect/expect.dart";
 
-class A { const A(); }
-class B extends A { const B(); }
+class A {
+  const A();
+}
+
+class B extends A {
+  const B();
+}
 
 main() {
   var map1 = new Map<B, B>();
   map1[const B()] = const B();
   var map2 = new Map<B, B>();
-  var list = <B>[ const B() ];
+  var list = <B>[const B()];
 
   var maps = [map1, map2];
   for (var map in maps) {