dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/lookup_map/reachable_data2_test.dart

 // Copyright (c) 2015, 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:lookup_map/lookup_map.dart';
 import 'package:expect/expect.dart';
 
-class Key { final x; const Key(this.x); }
+class Key {
+  final x;
+  const Key(this.x);
+}
+
 const A = const Key(1);
 const B = const Key(2);
 const C = const Key(3);
 const D = const Key(4);
 const E = const Key(5);
 const map = const LookupMap(const [
-    A, const ["the-text-for-A", B],
-    B, const ["the-text-for-B", C],
-    C, const ["the-text-for-C"],
-    D, const ["the-text-for-D", E],
-    E, const ["the-text-for-E"],
+  A,
+  const ["the-text-for-A", B],
+  B,
+  const ["the-text-for-B", C],
+  C,
+  const ["the-text-for-C"],
+  D,
+  const ["the-text-for-D", E],
+  E,
+  const ["the-text-for-E"],
 ]);
 main() {
   Expect.equals(map[map[A][1]][0], 'the-text-for-B');
 }