dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/basic_class_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.
 
-class A {
-}
+class A {}
 
-class SubA extends A {
-}
+class SubA extends A {}
 
-class B {
-}
+class B {}
 
 void main() {
   A a;
   SubA subA;
   B b;
   a = a;
   a = subA;
-  a = b; /// 01: static type warning
+  a = b;
+
+  /// 01: static type warning

[Siggi Cherem (dart-lang), 2016/09/16 20:55:23]

revert

[Harry Terkelsen, 2016/09/16 21:44:03]

Done.

   subA = a;
   subA = subA;
-  subA = b; /// 02: static type warning
-  b = a; /// 03: static type warning
-  b = subA; /// 04: static type warning
+  subA = b;
+
+  /// 02: static type warning
+  b = a;
+
+  /// 03: static type warning
+  b = subA;
+
+  /// 04: static type warning
   b = b;
 }