Don't use "var" to introduce the deferred_initializer.

pkg/compiler/lib/src/native/native.dart

 // Copyright (c) 2012, 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 native;
 
 import 'dart:collection' show Queue;
 
 import '../common.dart';
 import '../common/backend_api.dart' show
@@ skipping 45 matching lines @@
 part 'enqueue.dart';
 part 'js.dart';
 part 'scanner.dart';
 part 'ssa.dart';
 
 bool maybeEnableNative(Compiler compiler,
                        LibraryElement library) {
   String libraryName = library.canonicalUri.toString();
   if (library.entryCompilationUnit.script.name.contains(
           'sdk/tests/compiler/dart2js_native')
+      || library.entryCompilationUnit.script.name.contains(
+          'sdk/tests/compiler/dart2js_extra')
       || libraryName == 'dart:async'
       || libraryName == 'dart:html'
       || libraryName == 'dart:html_common'
       || libraryName == 'dart:indexed_db'
       || libraryName == 'dart:js'
       || libraryName == 'dart:svg'
       || libraryName == 'dart:_native_typed_data'
       || libraryName == 'dart:web_audio'
       || libraryName == 'dart:web_gl'
       || libraryName == 'dart:web_sql'
       || compiler.allowNativeExtensions) {
     return true;
   }
   return false;
 }