Fix some failures on the windows bots

pkg/analyzer/test/generated/package_test.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.generated.package_test;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/package.dart';
@@ skipping 14 matching lines @@
   defineReflectiveTests(PackageManagerTest);
 }
 
 /**
  * The name of the pubspec.yaml file.
  */
 const String pubspecName = 'pubspec.yaml';
 
 @reflectiveTest
 class DependencyFinderTest extends ResolverTestCase {
-  /**
-   * The resource provider to be used by tests.
-   */
-  MemoryResourceProvider resourceProvider;
-
-  @override
-  void setUp() {
-    resourceProvider = new MemoryResourceProvider();
-  }
-
   void test_transitiveDependenciesFor_circularDependencies() {
     String packageA = '/pub-cache/a-1.0';
     String packageB = '/pub-cache/b-1.0';
     String packageC = '/pub-cache/c-1.0';
     resourceProvider.newFile(
         '$packageA/$pubspecName',
         '''
     dependencies:
       b: any
     ''');
@@ skipping 150 matching lines @@
     DartSdk sdk = new MockSdk();
     AnalysisOptions options = new AnalysisOptionsImpl();
     PackageDescription first = new PackageDescription(packageId, sdk, options);
     PackageDescription second = new PackageDescription(packageId, sdk, options);
     expect(first == second, isTrue);
   }
 }
 
 @reflectiveTest
 class PackageManagerTest extends ResolverTestCase {
-  /**
-   * The resource provider to be used by tests.
-   */
-  MemoryResourceProvider resourceProvider;
-
-  @override
-  void setUp() {
-    resourceProvider = new MemoryResourceProvider();
-  }
-
   void test_getContext() {
     String packageA = '/pub-cache/a-1.0';
     String packageB1 = '/pub-cache/b-1.0';
     String packageB2 = '/pub-cache/b-2.0';
     String packageC = '/pub-cache/c-1.0';
     resourceProvider.newFile(
         '$packageA/$pubspecName',
         '''
     dependencies:
       b: any
@@ skipping 50 matching lines @@
 
   @override
   Map<String, Uri> asMap() => map;
 
   @override
   Uri resolve(Uri packageUri, {Uri notFound(Uri packageUri)}) {
     fail('Unexpected invocation of resolve');
     return null;
   }
 }