dart2js: run dartfmt on tests

tests/compiler/dart2js/jsinterop/abstract_test.dart

 // Copyright (c) 2016, 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.
 
 library jsinterop.abstract_test;
 
 import 'package:expect/expect.dart';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/common.dart';
 import '../memory_compiler.dart';
 
 void main() {
   asyncTest(() async {
     DiagnosticCollector collector = new DiagnosticCollector();
-    await runCompiler(
-        diagnosticHandler: collector,
-        memorySourceFiles: const {'main.dart': '''
+    await runCompiler(diagnosticHandler: collector, memorySourceFiles: const {
+      'main.dart': '''
 import 'package:js/js.dart';
 
 @JS()
 class A {
   get foo;
 }
 
 main() => new A();
-'''});
-    Expect.equals(0, collector.errors.length,
-        'Unexpected error count.');
-    Expect.equals(1, collector.warnings.length,
-        'Unexpected warning count.');
+'''
+    });
+    Expect.equals(0, collector.errors.length, 'Unexpected error count.');
+    Expect.equals(1, collector.warnings.length, 'Unexpected warning count.');
     Expect.equals(MessageKind.ABSTRACT_GETTER,
-        collector.warnings.first.messageKind,
-        'Unexpected warning.');
+        collector.warnings.first.messageKind, 'Unexpected warning.');
   });
-}
+}