Ensure that AnalysisContext futures are completed when context disposed.

pkg/analysis_server/lib/src/analysis_server.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 analysis.server;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analysis_server/src/analysis_logger.dart';
@@ skipping 1024 matching lines @@
   void removeContext(Folder folder) {
     AnalysisContext context = analysisServer.folderMap.remove(folder);
     if (analysisServer.index != null) {
       analysisServer.index.removeContext(context);
     }
     _onContextsChangedController.add(
         new ContextsChangedEvent(removed: [context]));
     analysisServer.sendContextAnalysisDoneNotifications(
         context,
         AnalysisDoneReason.CONTEXT_REMOVED);
+    context.dispose();
   }
 
   @override
   void updateContextPackageUriResolver(Folder contextFolder,
       UriResolver packageUriResolver) {
     AnalysisContext context = analysisServer.folderMap[contextFolder];
     context.sourceFactory = _createSourceFactory(packageUriResolver);
     _onContextsChangedController.add(
         new ContextsChangedEvent(changed: [context]));
     analysisServer.schedulePerformAnalysisOperation(context);
@@ skipping 12 matching lines @@
    * [packageUriResolver].
    */
   SourceFactory _createSourceFactory(UriResolver packageUriResolver) {
     List<UriResolver> resolvers = <UriResolver>[
         new DartUriResolver(analysisServer.defaultSdk),
         new ResourceUriResolver(resourceProvider),
         packageUriResolver];
     return new SourceFactory(resolvers);
   }
 }