Revert "Move dart2jslib parts into separate libraries."

tests/compiler/dart2js/simple_inferrer_final_field2_test.dart

 // Copyright (c) 2013, 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 a non-used generative constructor does not prevent
 // infering types for fields.
 
-import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
-
+import "package:async_helper/async_helper.dart";
 import 'compiler_helper.dart';
+import 'parser_helper.dart';
 
 const String TEST = """
 
 class A {
   final intField;
   final stringField;
   A() : intField = 42, stringField = 'foo';
   A.bar() : intField = 'bar', stringField = 42;
 }
 
@@ skipping 11 matching lines @@
     checkFieldTypeInClass(String className, String fieldName, type) {
       var cls = findElement(compiler, className);
       var element = cls.lookupLocalMember(fieldName);
       Expect.isTrue(typesInferrer.getTypeOfElement(element).containsOnly(type));
     }
 
     checkFieldTypeInClass('A', 'intField', compiler.backend.uint31Implementation);
     checkFieldTypeInClass('A', 'stringField', compiler.backend.stringImplementation);
   }));
 }