Possible fix for Windows bot failures

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 750 matching lines @@
       // folders), the only way we should be able to get here is due to a race
       // condition.  In any case, the package root folder is gone, so we can't
       // resolve packages.
       return new NoPackageFolderDisposition(packageRoot: packageRoot);
     } else {
       PackageMapInfo packageMapInfo;
       callbacks.beginComputePackageMap();
       try {
         if (ENABLE_PACKAGESPEC_SUPPORT) {
           // Try .packages first.
-          if (pathos.basename(packagespecFile.path) == PACKAGE_SPEC_NAME) {
+          if (pathContext.basename(packagespecFile.path) == PACKAGE_SPEC_NAME) {
             Packages packages = _readPackagespec(packagespecFile);
             return new PackagesFileDisposition(packages);
           }
         }
         if (packageResolverProvider != null) {
           UriResolver resolver = packageResolverProvider(folder);
           if (resolver != null) {
             return new CustomPackageResolverDisposition(resolver);
           }
         }
@@ skipping 229 matching lines @@
           String directoryPath = pathContext.dirname(path);
 
           // Check to see if we need to create a new context.
           if (info.isTopLevel) {
             // Only create a new context if this is not the same directory
             // described by our info object.
             if (info.folder.path != directoryPath) {
               if (_isPubspec(path)) {
                 // Check for a sibling .packages file.
                 if (!resourceProvider
-                    .getFile(pathos.join(directoryPath, PACKAGE_SPEC_NAME))
+                    .getFile(pathContext.join(directoryPath, PACKAGE_SPEC_NAME))
                     .exists) {
                   _extractContext(info, resource);
                   return;
                 }
               }
               if (_isPackagespec(path)) {
                 // Check for a sibling pubspec.yaml file.
                 if (!resourceProvider
-                    .getFile(pathos.join(directoryPath, PUBSPEC_NAME))
+                    .getFile(pathContext.join(directoryPath, PUBSPEC_NAME))
                     .exists) {
                   _extractContext(info, resource);
                   return;
                 }
               }
             }
           }
         } else {
           // pubspec was added in a sub-folder, extract a new context
           if (_isPubspec(path) &&
@@ skipping 25 matching lines @@
         // lingering pubspec.yaml before merging.
         if (!info.isTopLevel) {
           if (ENABLE_PACKAGESPEC_SUPPORT) {
             String directoryPath = pathContext.dirname(path);
 
             // Only merge if this is the same directory described by our info object.
             if (info.folder.path == directoryPath) {
               if (_isPubspec(path)) {
                 // Check for a sibling .packages file.
                 if (!resourceProvider
-                    .getFile(pathos.join(directoryPath, PACKAGE_SPEC_NAME))
+                    .getFile(pathContext.join(directoryPath, PACKAGE_SPEC_NAME))
                     .exists) {
                   _mergeContext(info);
                   return;
                 }
               }
               if (_isPackagespec(path)) {
                 // Check for a sibling pubspec.yaml file.
                 if (!resourceProvider
-                    .getFile(pathos.join(directoryPath, PUBSPEC_NAME))
+                    .getFile(pathContext.join(directoryPath, PUBSPEC_NAME))
                     .exists) {
                   _mergeContext(info);
                   return;
                 }
               }
             }
           } else {
             if (info.isPathToPackageDescription(path)) {
               _mergeContext(info);
               return;
@@ skipping 270 matching lines @@
   PackagesFileDisposition(this.packages) {}
 
   @override
   String get packageRoot => null;
 
   @override
   Iterable<UriResolver> createPackageUriResolvers(
           ResourceProvider resourceProvider) =>
       const <UriResolver>[];
 }