Change how File/Directory/Link .delete works.

sdk/lib/io/link.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;
 
 /**
  * [Link] objects are references to filesystem links.
  *
  */
@@ skipping 90 matching lines @@
    *
    * If the link does not exist, or is not a link, throws a LinkIOException.
    */
   String targetSync();
 }
 
 
 class _Link extends FileSystemEntity implements Link {
   final String path;
 
+  SendPort _fileService;
+
   _Link(String this.path);
 
   _Link.fromPath(Path inputPath) : path = inputPath.toNativePath();
 
   String toString() => "Link: '$path'";
 
   Future<bool> exists() {
     // TODO(whesse): Replace with asynchronous version.
     return new Future.immediate(existsSync());
   }
 
   bool existsSync() => FileSystemEntity.isLinkSync(path);
 
   Future<Link> create(String target) {
     // TODO(whesse): Replace with asynchronous version.
     return new Future.of(() {
       createSync(target);
       return this;
     });
   }
 
   void createSync(String target) {
     if (Platform.operatingSystem == 'windows') {
       target = _makeWindowsLinkTarget(target);
     }
     var result = _File._createLink(path, target);
-    if (result is OSError) {
-      throw new LinkIOException("Error in Link.createSync", result);
-    }
+    throwIfError(result, "Cannot create link '$path'");
   }
 
   // Put target into the form "\??\C:\my\target\dir".
   String _makeWindowsLinkTarget(String target) {
     if (target.startsWith('\\??\\')) {
       return target;
     }
     if (!(target.length > 3 && target[1] == ':' && target[2] == '\\')) {
       target = new File(target).fullPathSync();
     }
     if (target.length > 3 && target[1] == ':' && target[2] == '\\') {
       target = '\\??\\$target';
     } else {
       throw new ArgumentError(
           'Target $target of Link.create on Windows cannot be converted' +
           ' to start with a drive letter.  Unexpected error.');
     }
     return target;
   }
 
   void updateSync(String target, {bool linkRelative: false }) {
     // TODO(whesse): Replace with atomic update, where supported by platform.
     deleteSync();
     createSync(target);
   }
 
   Future<Link> delete() {
-    return new File(path).delete().then((_) => this);
+    _ensureFileService();
+    List request = new List(2);
+    request[0] = _DELETE_LINK_REQUEST;
+    request[1] = path;
+    return _fileService.call(request).then((response) {
+      if (_isErrorResponse(response)) {
+        throw _exceptionFromResponse(response, "Cannot delete link '$path'");
+      }
+      return this;
+    });
   }
 
   void deleteSync() {
-    new File(path).deleteSync();
+    var result = _File._deleteLink(path);
+    throwIfError(result, "Cannot delete link '$path'");
   }
 
   Future<String> target() {
     // TODO(whesse): Replace with asynchronous version.
     return new Future.of(targetSync);
   }
 
   String targetSync() {
     var result = _File._linkTarget(path);
+    throwIfError(result, "Cannot read link '$path'");
+    return result;
+  }
+
+  static throwIfError(Object result, String msg) {
     if (result is OSError) {
-      throw new LinkIOException("Error in Link.targetSync", result);
+      throw new FileIOException(msg, result);
     }
-    return result;
+  }
+
+  bool _isErrorResponse(response) {
+    return response is List && response[0] != _SUCCESS_RESPONSE;
+  }
+
+  void _ensureFileService() {
+    if (_fileService == null) {
+      _fileService = _FileUtils._newServicePort();
+    }
   }
 }
 
 
 class LinkIOException implements Exception {
   const LinkIOException([String this.message = "",
                          String this.path = "",
                          OSError this.osError = null]);
   String toString() {
     StringBuffer sb = new StringBuffer();
@@ skipping 11 matching lines @@
       if (path != null) {
         sb.write(", path = $path");
       }
     }
     return sb.toString();
   }
   final String message;
   final String path;
   final OSError osError;
 }