Revert "Move dart2jslib parts into separate libraries."

tests/compiler/dart2js/if_do_while_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 'dart:async';
 import 'package:expect/expect.dart';
 import 'package:async_helper/async_helper.dart';
 import 'compiler_helper.dart';
 
 const String TEST = r"""
 foo(param0, param1, param2) {
   if (param0)
     do {
       param1();
     } while(param2());
   else {
     param2();
   }
 }
 """;
 
 main() {
   print("foo");
   asyncTest(() => compile(TEST, entry: 'foo', check: (String generated) {
     // Check that the do-while in the 'then' is enclosed in braces.
     // Otherwise Android 4.0 stock browser has a syntax error. See issue 10923.
     Expect.isTrue(
         new RegExp(r'if[ ]*\([^)]+\)[ ]*\{[\n ]*do').hasMatch(generated));
   }));
 }