Incremental compiler: Use addStubs for adding methods.

dart/tests/try/web/incremental_compilation_update_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.
 
 library trydart.incremental_compilation_update_test;
 
 import 'dart:html' hide
     Element;
 
 import 'dart:async' show
@@ skipping 848 matching lines @@
   }
 }
 """,
             const <String>['v2']),
     ],
 
     // Test that removing a class is supported, using a static method.
     const <ProgramResult>[
         const ProgramResult(
             r"""
-import 'dart:collection';
-
 class C {
   static m() {
     print('v1');
   }
 }
 
 main() {
-  // TODO(ahe): The incremental compiler magter ikke static tear-off closures.
-  new HashMap(equals: identical);
   try {
     C.m();
   } catch (e) {
     print('v2');
   }
 }
 """,
             const <String>['v1']),
         const ProgramResult(
             r"""
@@ skipping 342 matching lines @@
   position: absolute;
   left: 0px;
   width: 3em;
   text-align: right;
   background-color: lightgoldenrodyellow;
 }
 ''');
   style.type = 'text/css';
   return style;
 }