Fix hints and clean-up obsolete comment syntax (TBR)

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:async';
 
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analysis_server/src/plugin/notification_manager.dart';
@@ skipping 2729 matching lines @@
 
   @override
   void removeContext(Folder folder, List<String> flushedFiles) {
     String path = folder.path;
     expect(currentContextRoots, contains(path));
     currentContextTimestamps.remove(path);
     currentContextFilePaths.remove(path);
     currentContextSources.remove(path);
     lastFlushedFiles = flushedFiles;
   }
-
-  @override
-  void updateContextPackageUriResolver(AnalysisContext context) {
-    // Nothing to do.
-  }
 }
 
 /**
  * A [Source] that knows it's [fullName].
  */
 class TestSource implements Source {
   TestSource();
 
   @override
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }
 
 class TestUriResolver extends UriResolver {
   Map<Uri, Source> uriMap;
 
   TestUriResolver(this.uriMap);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     return uriMap[uri];
   }
 }