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 146 matching lines @@
     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] = _LINK_DELETE_REQUEST;
+    request[1] = path;
+    return _fileService.call(request).then((response) {
+      if (_isErrorResponse(response)) {
+        throw _exceptionFromResponse(response, "Cannot delete file '$path'");
+      }
+      return this;
+    });
   }
 
   void deleteSync() {
-    new File(path).deleteSync();
+    var result = _File._deleteLink(path);
+    throwIfError(result, "Cannot delete file '$path'");
   }
 
   Future<String> target() {
     // TODO(whesse): Replace with asynchronous version.
     return new Future.of(targetSync);
   }
 
   String targetSync() {
     var result = _File._linkTarget(path);
     if (result is OSError) {
       throw new LinkIOException("Error in Link.targetSync", result);
     }
     return result;
   }
+
+  static throwIfError(Object result, String msg) {
+    if (result is OSError) {
+      throw new FileIOException(msg, result);
+    }
+  }
 }
 
 
 class LinkIOException implements Exception {
   const LinkIOException([String this.message = "",
                          String this.path = "",
                          OSError this.osError = null]);
   String toString() {
     StringBuffer sb = new StringBuffer();
     sb.write("LinkIOException");
@@ skipping 10 matching lines @@
       if (path != null) {
         sb.write(", path = $path");
       }
     }
     return sb.toString();
   }
   final String message;
   final String path;
   final OSError osError;
 }