Normalize paths in PhysicalResourceProvider.getFile()/getFolder().

pkg/analyzer/lib/src/context/builder.dart

 // Copyright (c) 2016, 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_builder;
 
 import 'dart:collection';
 import 'dart:core' hide Resource;
 import 'dart:io' as io;
 
@@ skipping 126 matching lines @@
     return context;
   }
 
   Map<String, List<Folder>> convertPackagesToMap(Packages packages) {
     if (packages == null || packages == Packages.noPackages) {
       return null;
     }
     Map<String, List<Folder>> folderMap = new HashMap<String, List<Folder>>();
     packages.asMap().forEach((String packagePath, Uri uri) {
       String path = resourceProvider.pathContext.fromUri(uri);
-      if (path.endsWith(resourceProvider.pathContext.separator)) {
-        path = path.substring(0, path.length - 1);
-      }
       folderMap[packagePath] = [resourceProvider.getFolder(path)];
     });
     return folderMap;
   }
 
 //  void _processAnalysisOptions(
 //      AnalysisContext context, Map<String, YamlNode> optionMap) {
 //    List<OptionsProcessor> optionsProcessors =
 //        AnalysisEngine.instance.optionsPlugin.optionsProcessors;
 //    try {
@@ skipping 284 matching lines @@
   String _readEmbedderYaml(Folder libDir) {
     File file = libDir.getChild(EMBEDDER_FILE_NAME);
     try {
       return file.readAsStringSync();
     } on FileSystemException {
       // File can't be read.
       return null;
     }
   }
 }