MemoryResourceProvider always uses the current platform

pkg/analyzer/test/embedder_tests.dart

 // Copyright (c) 2016, 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 analyzer.test.embedder_tests;
 
 import 'dart:core';
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:path/path.dart' as path;
 
 import 'resource_utils.dart';
 import 'utils.dart';
 
 abstract class EmbedderRelatedTest {
   final String emptyPath = '/home/.pub-cache/empty';
   final String foxPath = '/home/.pub-cache/fox';
   final String foxLib = '/home/.pub-cache/fox/lib';
 
   TestPathTranslator pathTranslator;
   ResourceProvider resourceProvider;
 
   buildResourceProvider() {
-    MemoryResourceProvider rawProvider =
-        new MemoryResourceProvider(isWindows: isWindows);
+    MemoryResourceProvider rawProvider = new MemoryResourceProvider();
     resourceProvider = new TestResourceProvider(rawProvider);
     pathTranslator = new TestPathTranslator(rawProvider)
       ..newFolder('/home/.pub-cache/empty')
       ..newFolder('/home/.pub-cache/fox/lib')
       ..newFile(
           '/home/.pub-cache/fox/lib/_embedder.yaml',
           r'''
 embedded_libs:
   "dart:core" : "core.dart"
   "dart:fox": "slippy.dart"
@@ skipping 12 matching lines @@
   void setUp() {
     initializeTestEnvironment(path.context);
     buildResourceProvider();
   }
 
   void tearDown() {
     initializeTestEnvironment();
     clearResourceProvider();
   }
 }