Increase expectedMethodCount to account for new methods from UnmodifiableMapView.

dart/tests/compiler/dart2js/mirrors_used_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 the @MirrorsUsed annotation suppress hints and that only
 /// requested elements are retained for reflection.
 library dart2js.test.mirrors_used_test;
 
 import 'package:expect/expect.dart';
 
@@ skipping 30 matching lines @@
   for (var element in generatedCode) {
     print(element);
   }
   print('');
 
   // This assertion can fail for two reasons:
   // 1. Too many elements retained for reflection.
   // 2. Some code was refactored, and there are more methods.
   // Either situation could be problematic, but in situation 2, it is often
   // acceptable to increase [expectedMethodCount] a little.
-  int expectedMethodCount = 317;
+  int expectedMethodCount = 321;
   Expect.isTrue(
       generatedCode.length <= expectedMethodCount,
       'Too many compiled methods: '
       '${generatedCode.length} > $expectedMethodCount');
 
   // The following names should be retained:
   List expectedNames = [
       'Foo', // The name of class Foo.
       r'Foo$', // The name of class Foo's constructor.
       'Foo_staticMethod', // The name of Foo.staticMethod.
@@ skipping 48 matching lines @@
 library lib;
 
 import 'dart:mirrors';
 
 useReflect(type) {
   print(new Symbol('Foo'));
   print(MirrorSystem.getName(reflectClass(type).owner.qualifiedName));
 }
 """,
 };