dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/string_interpolation_opt1_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.
 
 import "package:expect/expect.dart";
 import 'dart:math';
 
 // Test that String interpolation works in some optimized cases.
 
 bool get inscrutableFalse => new Random().nextDouble() > 2;
 
 returnsNullOrString(x) {
   if (inscrutableFalse) return 'hi';
   if (inscrutableFalse) return null;
   return x;
 }
 
 returnsNullOrInt(x) {
   if (inscrutableFalse) return 123;
   if (inscrutableFalse) return null;
   return x;
 }
 
 spoil(a) {
   a[3] = 123;
   a[4] = 'ddd';
 }
 
 void testString() {
-  var a = new List(100);  // 'null' values in here are JavaScript undefined.
+  var a = new List(100); // 'null' values in here are JavaScript undefined.
   spoil(a);
   var s = returnsNullOrString('hi');
   var x = a[2];
   if (x == null) {
     s = returnsNullOrString(x);
   }
 
   Expect.equals('s: null', 's: $s');
 }
 
 void testInt() {
-  var a = new List(100);  // 'null' values in here are JavaScript undefined.
+  var a = new List(100); // 'null' values in here are JavaScript undefined.
   spoil(a);
   var s = returnsNullOrInt(123);
   var x = a[2];
   if (x == null) {
     s = returnsNullOrInt(x);
   }
 
   Expect.equals('s: null', 's: $s');
 }
 
 void main() {
   testInt();
   testString();
 }