Fixes for context_manager_test on Windows.

pkg/analysis_server/test/context_manager_test.dart

Index: pkg/analysis_server/test/context_manager_test.dart
diff --git a/pkg/analysis_server/test/context_manager_test.dart b/pkg/analysis_server/test/context_manager_test.dart
index 2f481cc0c4af12234c73181779a7b3062f6c7b4b..5b2416e62286b4b3c95144e627e6642ca525c835 100644
--- a/pkg/analysis_server/test/context_manager_test.dart
+++ b/pkg/analysis_server/test/context_manager_test.dart
@@ -2659,7 +2659,7 @@ class TestContextManagerCallbacks extends ContextManagerCallbacks {
       }
     }
     resolvers.addAll(disposition.createPackageUriResolvers(resourceProvider));
-    resolvers.add(new ResourceUriResolver(PhysicalResourceProvider.INSTANCE));
+    resolvers.add(new ResourceUriResolver(resourceProvider));
     currentContext.analysisOptions = options;
     currentContext.sourceFactory =
         new SourceFactory(resolvers, disposition.packages);