Handle file additions/removals in ContextDirectoryManager.

pkg/analysis_server/test/resource_test.dart

Index: pkg/analysis_server/test/resource_test.dart
diff --git a/pkg/analysis_server/test/resource_test.dart b/pkg/analysis_server/test/resource_test.dart
index 535b5db8d734835621bc4b48cf73786569148c97..15f319b9098fa2ba05ccc39f330524f43726f980 100644
--- a/pkg/analysis_server/test/resource_test.dart
+++ b/pkg/analysis_server/test/resource_test.dart
@@ -242,7 +242,7 @@ main() {
 
       test('fullName', () {
         File file = provider.getResource('/foo/bar/file.txt');
-        expect(file.fullName, '/foo/bar/file.txt');
+        expect(file.path, '/foo/bar/file.txt');
       });
 
       test('hashCode', () {
@@ -553,7 +553,7 @@ main() {
       });
 
       test('fullName', () {
-        expect(file.fullName, path);
+        expect(file.path, path);
       });
 
       test('hashCode', () {