(TBR) fix embedder tests on Windows

pkg/analyzer/test/source/embedder_test.dart

 // Copyright (c) 2015, 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.source.embedder_test;
 
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/embedder.dart';
 import 'package:analyzer/src/generated/java_io.dart';
 import 'package:analyzer/src/generated/source.dart';
@@ skipping 22 matching lines @@
     });
     test('test_EmbedderYaml', () {
       var locator = new EmbedderYamlLocator({
         'fox': [resourceProvider.getResource('/tmp')]
       });
       var resolver = new EmbedderUriResolver(locator.embedderYamls);
 
       expectResolved(dartUri, filePath) {
         Source source = resolver.resolveAbsolute(Uri.parse(dartUri));
         expect(source, isNotNull, reason: dartUri);
-        expect(source.fullName, filePath);
+        expect(source.fullName, filePath.replaceAll('/', JavaFile.separator));
       }
 
       // We have four mappings.
       expect(resolver.length, equals(4));
       // Check that they map to the correct paths.
       expectResolved('dart:fox', '/tmp/slippy.dart');
       expectResolved('dart:bear', '/tmp/grizzly.dart');
       expectResolved('dart:relative', '/relative.dart');
       expectResolved('dart:deep', '/tmp/deep/directory/file.dart');
     });
@@ skipping 103 matching lines @@
   "dart:bear": "grizzly.dart"
   "dart:relative": "../relative.dart"
   "dart:deep": "deep/directory/file.dart"
   "fart:loudly": "nomatter.dart"
 ''');
 }
 
 clearResourceProvider() {
   resourceProvider = null;
 }