Incremental compiler: Use addStubs for adding methods.

dart/tests/try/web/incremental_compilation_update_test.dart

Index: dart/tests/try/web/incremental_compilation_update_test.dart
diff --git a/dart/tests/try/web/incremental_compilation_update_test.dart b/dart/tests/try/web/incremental_compilation_update_test.dart
index 1534b141f65903accccf8fee9c759e0d56c046ae..3939f130bf8b0ceacd7ddcaaf6cc81271b6a7b3d 100644
--- a/dart/tests/try/web/incremental_compilation_update_test.dart
+++ b/dart/tests/try/web/incremental_compilation_update_test.dart
@@ -866,8 +866,6 @@ main() {
     const <ProgramResult>[
         const ProgramResult(
             r"""
-import 'dart:collection';
-
 class C {
   static m() {
     print('v1');
@@ -875,8 +873,6 @@ class C {
 }
 
 main() {
-  // TODO(ahe): The incremental compiler magter ikke static tear-off closures.
-  new HashMap(equals: identical);
   try {
     C.m();
   } catch (e) {