Fix test failures under windows

pkg/analysis_server/test/context_manager_test.dart

 // Copyright (c) 2014, 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 test.context.directory.manager;
 
 import 'dart:collection';
 import 'dart:io' as io;
 
 import 'package:analysis_server/src/context_manager.dart';
@@ skipping 138 matching lines @@
     manager.setRoots(<String>[projPath], <String>[], <String, String>{});
     await pumpEventQueue();
     // Confirm that one context was created.
     var contexts =
         manager.contextsInAnalysisRoot(resourceProvider.newFolder(projPath));
     expect(contexts, isNotNull);
     expect(contexts.length, equals(1));
     var context = contexts[0];
     var source = context.sourceFactory.forUri('dart:foobar');
     expect(source, isNotNull);
-    expect(
-        source.fullName,
-        '/my/proj/sdk_ext/entry.dart'
-            .replaceAll('/', io.Platform.pathSeparator));
+    expect(source.fullName, '/my/proj/sdk_ext/entry.dart');
     // We can't find dart:core because we didn't list it in our
     // embedded_libs map.
     expect(context.sourceFactory.forUri('dart:core'), isNull);
     // We can find dart:typed_data because we listed it in our
     // embedded_libs map.
     expect(context.sourceFactory.forUri('dart:typed_data'), isNotNull);
   }
 
   test_ignoreFilesInPackagesFolder() {
     // create a context with a pubspec.yaml file
@@ skipping 1984 matching lines @@
         lintNames,
         unorderedEquals([
           'avoid_as' /* embedder */,
           'always_specify_types' /* config*/,
           'camel_case_types' /* options */
         ]));
 
     // Sanity check embedder libs.
     var source = context.sourceFactory.forUri('dart:foobar');
     expect(source, isNotNull);
-    expect(
-        source.fullName,
-        '/my/proj/sdk_ext/entry.dart'
-            .replaceAll('/', io.Platform.pathSeparator));
+    expect(source.fullName, '/my/proj/sdk_ext/entry.dart');
   }
 
   test_embedder_options() async {
     // Create files.
     String libPath = newFolder([projPath, ContextManagerTest.LIB_NAME]);
     String sdkExtPath = newFolder([projPath, 'sdk_ext']);
     newFile([projPath, 'test', 'test.dart']);
     newFile([sdkExtPath, 'entry.dart']);
     // Setup _embedder.yaml.
     newFile(
@@ skipping 70 matching lines @@
     var lintNames = lints.map((lint) => lint.name);
 
     expect(
         lintNames,
         unorderedEquals(
             ['avoid_as' /* embedder */, 'camel_case_types' /* options */]));
 
     // Sanity check embedder libs.
     var source = context.sourceFactory.forUri('dart:foobar');
     expect(source, isNotNull);
-    expect(
-        source.fullName,
-        '/my/proj/sdk_ext/entry.dart'
-            .replaceAll('/', io.Platform.pathSeparator));
+    expect(source.fullName, '/my/proj/sdk_ext/entry.dart');
   }
 
   test_error_filter_analysis_option() async {
     // Create files.
     newFile(
         [projPath, optionsFileName],
         r'''
 analyzer:
   errors:
     unused_local_variable: ignore
@@ skipping 491 matching lines @@
 class TestUriResolver extends UriResolver {
   Map<Uri, Source> uriMap;
 
   TestUriResolver(this.uriMap);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     return uriMap[uri];
   }
 }