Use AbsolutePathContext in Folder.contains().

pkg/analysis_server/lib/src/context_manager.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 context.directory.manager;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:core' hide Resource;
@@ skipping 325 matching lines @@
    * File name of package spec files.
    */
   static const String PACKAGE_SPEC_NAME = '.packages';
 
   /**
    * The [ResourceProvider] using which paths are converted into [Resource]s.
    */
   final ResourceProvider resourceProvider;
 
   /**
-   * The context used to work with file system paths.
-   */
-  pathos.Context pathContext;
-
-  /**
    * The context used to work with absolute file system paths.
    *
    * TODO(scheglov) remove [pathContext].
    */
   AbsolutePathContext absolutePathContext;
 
   /**
+   * The context used to work with file system paths.
+   */
+  pathos.Context pathContext;
+
+  /**
    * The list of excluded paths (folders and files) most recently passed to
    * [setRoots].
    */
   List<String> excludedPaths = <String>[];
 
   /**
    * The list of included paths (folders and files) most recently passed to
    * [setRoots].
    */
   List<String> includedPaths = <String>[];
@@ skipping 42 matching lines @@
 
   /**
    * Stream subscription we are using to watch each analysis root directory for
    * changes.
    */
   final Map<Folder, StreamSubscription<WatchEvent>> changeSubscriptions =
       <Folder, StreamSubscription<WatchEvent>>{};
 
   ContextManagerImpl(this.resourceProvider, this.packageResolverProvider,
       this._packageMapProvider, this._instrumentationService) {
+    absolutePathContext = resourceProvider.absolutePathContext;
     pathContext = resourceProvider.pathContext;
-    absolutePathContext = new AbsolutePathContext(pathContext.separator);
   }
 
   @override
   List<AnalysisContext> contextsInAnalysisRoot(Folder analysisRoot) {
     List<AnalysisContext> contexts = <AnalysisContext>[];
     ContextInfo innermostContainingInfo =
         _getInnermostContextInfoFor(analysisRoot.path);
     void addContextAndDescendants(ContextInfo info) {
       contexts.add(info.context);
       info.children.forEach(addContextAndDescendants);
@@ skipping 1037 matching lines @@
           var path = resourceProvider.pathContext.fromUri(uri);
           packageMap[name] = <Folder>[resourceProvider.getFolder(path)];
         }
       });
       return <UriResolver>[new SdkExtUriResolver(packageMap)];
     } else {
       return const <UriResolver>[];
     }
   }
 }