Issue 27130. Fix applying changes to .analysis_options on save.

pkg/analyzer/lib/src/context/context.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.src.context.context;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 602 matching lines @@
       if (level == AnalysisLevel.NONE) {
         changeSet.removedSource(source);
       } else {
         changeSet.addedSource(source);
       }
     });
     applyChanges(changeSet);
   }
 
   @override
-  ApplyChangesStatus applyChanges(ChangeSet changeSet) {
+  void applyChanges(ChangeSet changeSet) {
     if (changeSet.isEmpty) {
-      return new ApplyChangesStatus(false);
+      return;
     }
     //
     // First, compute the list of sources that have been removed.
     //
     List<Source> removedSources = changeSet.removedSources.toList();
     for (SourceContainer container in changeSet.removedContainers) {
       _addSourcesInContainer(removedSources, container);
     }
     //
     // Then determine which cached results are no longer valid.
@@ skipping 22 matching lines @@
       _sourceDeleted(source);
     }
     for (Source source in removedSources) {
       _sourceRemoved(source);
     }
     for (WorkManager workManager in workManagers) {
       workManager.applyChange(
           changeSet.addedSources, changedSources, removedSources);
     }
     _onSourcesChangedController.add(new SourcesChangedEvent(changeSet));
-    return new ApplyChangesStatus(changeSet.addedSources.isNotEmpty ||
-        changeSet.changedContents.isNotEmpty ||
-        changeSet.deletedSources.isNotEmpty ||
-        changedSources.isNotEmpty ||
-        removedSources.isNotEmpty);
   }
 
   @override
   String computeDocumentationComment(Element element) =>
       element?.documentationComment;
 
   @override
   List<AnalysisError> computeErrors(Source source) {
     String name = source.shortName;
     if (AnalysisEngine.isHtmlFileName(name)) {
@@ skipping 1629 matching lines @@
     }
     DartSdk sdk = factory.dartSdk;
     if (sdk == null) {
       throw new IllegalArgumentException(
           "The source factory for an SDK analysis context must have a DartUriResolver");
     }
     return new AnalysisCache(
         <CachePartition>[AnalysisEngine.instance.partitionManager.forSdk(sdk)]);
   }
 }