Nicer pretty printing of jsAst object literals.

tests/compiler/dart2js/class_codegen_test.dart

 // Copyright (c) 2012, 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 parameters keep their names in the output.
 
 import 'dart:async';
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 import 'compiler_helper.dart';
 import 'parser_helper.dart';
@@ skipping 49 matching lines @@
   A(a) : this.a = a {}
 }
 
 main() {
   new A(3);
 }
 """;
 
 twoClasses() {
   asyncTest(() => compileAll(TEST_ONE).then((generated) {
-    Expect.isTrue(generated.contains('A: {"": "Object;"'));
-    Expect.isTrue(generated.contains('B: {"": "Object;"'));
+    Expect.isTrue(generated.contains(new RegExp('A: {[ \n]*"": "Object;"')));
+    Expect.isTrue(generated.contains(new RegExp('B: {[ \n]*"": "Object;"')));
   }));
 }
 
 subClass() {
   checkOutput(String generated) {
-    Expect.isTrue(generated.contains('A: {"": "Object;"'));
-    Expect.isTrue(generated.contains('B: {"": "A;"'));
+    Expect.isTrue(generated.contains(new RegExp('A: {[ \n]*"": "Object;"')));
+    Expect.isTrue(generated.contains(new RegExp('B: {[ \n]*"": "A;"')));
   }
 
   asyncTest(() => compileAll(TEST_TWO).then(checkOutput));
   asyncTest(() => compileAll(TEST_THREE).then(checkOutput));
 }
 
 fieldTest() {
   asyncTest(() => compileAll(TEST_FOUR).then((generated) {
-    Expect.isTrue(generated.contains(r"""B: {"": "A;y,z,x", static:"""));
+    Expect.isTrue(generated.contains(
+        new RegExp('B: {[ \n]*"": "A;y,z,x",[ \n]*static:')));
   }));
 }
 
 constructor1() {
   asyncTest(() => compileAll(TEST_FIVE).then((generated) {
     Expect.isTrue(generated.contains(new RegExp(r"new [$A-Z]+\.A\(a\);")));
   }));
 }
 
 main() {
   twoClasses();
   subClass();
   fieldTest();
   constructor1();
 }