Format all tests.

tests/corelib/map_keys2_test.dart

Index: tests/corelib/map_keys2_test.dart
diff --git a/tests/corelib/map_keys2_test.dart b/tests/corelib/map_keys2_test.dart
index d297c2d77d929ab89532c35223c43550c02c7f40..88ba49155fbaa5079b6b7dca581bdb032361025a 100644
--- a/tests/corelib/map_keys2_test.dart
+++ b/tests/corelib/map_keys2_test.dart
@@ -5,9 +5,9 @@
 import "package:expect/expect.dart";
 
 main() {
-  var map1 = { "foo": 42, "bar": 499 };
+  var map1 = {"foo": 42, "bar": 499};
   var map2 = {};
-  var map3 = const { "foo": 42, "bar": 499 };
+  var map3 = const {"foo": 42, "bar": 499};
   var map4 = const {};
   var map5 = new Map<String, int>();
   map5["foo"] = 43;