fix embedder url mapping 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 86 matching lines @@
         'fox': [resourceProvider.getResource('/tmp')]
       });
       var resolver = new EmbedderUriResolver(locator.embedderYamls);
       var sdk = resolver.dartSdk;
 
       expectSource(String filePath, String dartUri) {
         var uri = Uri.parse(filePath);
         var source = sdk.fromFileUri(uri);
         expect(source, isNotNull, reason: filePath);
         expect(source.uri.toString(), dartUri);
-        expect(source.fullName, filePath);
+        expect(source.fullName, filePath.replaceAll('/', JavaFile.separator));
       }
 
       expectSource('/tmp/slippy.dart', 'dart:fox');
       expectSource('/tmp/deep/directory/file.dart', 'dart:deep');
       expectSource('/tmp/deep/directory/part.dart', 'dart:deep/part.dart');
     });
     test('test_EmbedderSdk_getSdkLibrary', () {
       var locator = new EmbedderYamlLocator({
         'fox': [resourceProvider.getResource('/tmp')]
       });
@@ skipping 39 matching lines @@
   "dart:bear": "grizzly.dart"
   "dart:relative": "../relative.dart"
   "dart:deep": "deep/directory/file.dart"
   "fart:loudly": "nomatter.dart"
 ''');
 }
 
 clearResourceProvider() {
   resourceProvider = null;
 }