Fix FileSystemEntity:stat to remove trailing slashes, on Windows.

sdk/lib/io/file_system_entity.dart

 // Copyright (c) 2013, 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.
 
 part of dart.io;
 
 class FileSystemEntityType {
   static const FILE = const FileSystemEntityType._internal(0);
   static const DIRECTORY = const FileSystemEntityType._internal(1);
   static const LINK = const FileSystemEntityType._internal(2);
@@ skipping 65 matching lines @@
   external static List<int> _statSync(String path);
 
 
   /**
    * Calls the operating system's stat() function on [path].
    * Returns a [FileStat] object containing the data returned by stat().
    * If the call fails, returns a [FileStat] object with .type set to
    * FileSystemEntityType.NOT_FOUND and the other fields invalid.
    */
   static FileStat statSync(String path) {
+    // Trailing path is not supported on Windows.
+    if (Platform.isWindows) {
+      path = FileSystemEntity._trimTrailingPathSeparators(path);
+    }
     var data = _statSync(path);
-    if (data is Error) throw data;
+    if (data is OSError) throw data;
     return new FileStat._internal(
         new DateTime.fromMillisecondsSinceEpoch(data[_CHANGED_TIME] * 1000),
         new DateTime.fromMillisecondsSinceEpoch(data[_MODIFIED_TIME] * 1000),
         new DateTime.fromMillisecondsSinceEpoch(data[_ACCESSED_TIME] * 1000),
         FileSystemEntityType._lookup(data[_TYPE]),
         data[_MODE],
         data[_SIZE]);
   }
 
   /**
    * Asynchronously calls the operating system's stat() function on [path].
    * Returns a Future which completes with a [FileStat] object containing
    * the data returned by stat().
    * If the call fails, completes the future with a [FileStat] object with
    * .type set to FileSystemEntityType.NOT_FOUND and the other fields invalid.
    */
   static Future<FileStat> stat(String path) {
+    // Trailing path is not supported on Windows.
+    if (Platform.isWindows) {
+      path = FileSystemEntity._trimTrailingPathSeparators(path);
+    }
     return _IOService.dispatch(_FILE_STAT, [path]).then((response) {
       if (_isErrorResponse(response)) {
         throw _exceptionFromResponse(response,
                                      "Error getting stat",
                                      path);
       }
       // Unwrap the real list from the "I'm not an error" wrapper.
       List data = response[1];
       return new FileStat._internal(
           new DateTime.fromMillisecondsSinceEpoch(data[_CHANGED_TIME] * 1000),
@@ skipping 641 matching lines @@
     return buffer.toString();
   }
 }
 
 
 class _FileSystemWatcher {
   external static Stream<FileSystemEvent> watch(
       String path, int events, bool recursive);
   external static bool get isSupported;
 }