dart2js: run dartfmt on tests

tests/compiler/dart2js/source_map_test.dart

 // Copyright (c) 2014, 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.
 
 // Test that options '--source-map' and '--out' correctly adds
 // `sourceMappingURL` and "file" attributes to source file and source map file.
 
 library test.source_map;
 
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 import 'memory_compiler.dart';
 
 const SOURCE = const {
   '/main.dart': """
 main() {}
 """,
 };
 
 void find(String text, String substring, bool expected) {
   bool found = text.contains(substring);
 
   if (expected && !found) {
     Expect.isTrue(found, 'Expected "$substring" in:\n$text');
   }
   if (!expected && found) {
-    Expect.isFalse(found,
+    Expect.isFalse(
+        found,
         'Unexpected "$substring" in:\n'
         '${text.substring(text.indexOf(substring))}');
   }
 }
 
 test({String out, String sourceMap, String mapping, String file}) async {
   OutputCollector collector = new OutputCollector();
   List<String> options = <String>[];
   if (out != null) {
     options.add("--out=$out");
@@ skipping 22 matching lines @@
   } else {
     find(jsSourceMapOutput, '"file": ', false);
   }
 }
 
 void main() {
   asyncTest(() async {
     await test();
     await test(sourceMap: 'file:/out.js.map');
     await test(out: 'file:/out.js');
-    await test(out: 'file:/out.js', sourceMap: 'file:/out.js.map',
-               file: 'out.js', mapping: 'out.js.map');
-    await test(out: 'file:/dir/out.js', sourceMap: 'file:/dir/out.js.map',
-               file: 'out.js', mapping: 'out.js.map');
+    await test(
+        out: 'file:/out.js',
+        sourceMap: 'file:/out.js.map',
+        file: 'out.js',
+        mapping: 'out.js.map');
+    await test(
+        out: 'file:/dir/out.js',
+        sourceMap: 'file:/dir/out.js.map',
+        file: 'out.js',
+        mapping: 'out.js.map');
   });
-}
+}