Format all tests.

tests/language/const_map4_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
 
 main() {
-    var a = {1: 'a', 2: 'b', 3: 'c'};
-    var b = {1: 'a', 2: 'b', 3: 'c'};
-    Expect.equals(false, a == b);
+  var a = {1: 'a', 2: 'b', 3: 'c'};
+  var b = {1: 'a', 2: 'b', 3: 'c'};
+  Expect.equals(false, a == b);
 
-    a = const {1: 'a', 2: 'b', 3: 'c'};
-    b = const {1: 'a', 2: 'b', 3: 'c'};
-    Expect.equals(true, a == b);
+  a = const {1: 'a', 2: 'b', 3: 'c'};
+  b = const {1: 'a', 2: 'b', 3: 'c'};
+  Expect.equals(true, a == b);
 
-    a = const <num,String>{1: 'a', 2: 'b', 3: 'c'};
-    b = const {1: 'a', 2: 'b', 3: 'c'};
-    Expect.equals(false, a == b);
+  a = const <num, String>{1: 'a', 2: 'b', 3: 'c'};
+  b = const {1: 'a', 2: 'b', 3: 'c'};
+  Expect.equals(false, a == b);
 
-    a = const <dynamic,dynamic>{1: 'a', 2: 'b', 3: 'c'};
-    b = const {1: 'a', 2: 'b', 3: 'c'};
-    Expect.equals(true, a == b);
+  a = const <dynamic, dynamic>{1: 'a', 2: 'b', 3: 'c'};
+  b = const {1: 'a', 2: 'b', 3: 'c'};
+  Expect.equals(true, a == b);
 }