This class wasn't used anyway. Removing as it causes errors due to recent VM changes.

client/html/src/Element.dart

 // Copyright (c) 2011, 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.
 
 interface ElementList extends List<Element> {
   // TODO(jacobr): add element batch manipulation methods.
   Element get first();
   // TODO(jacobr): add insertAt
 }
 
 class DeferredElementRect {
   // TODO(jacobr)
 }
 
-class ScrollOptions {
-  final int lines;
-  final int pages;
-  final bool center;
-
-  ScrollOptions([this.lines = 0, this.pages = 0, this.center = false]);
-}
-
 interface ElementEvents extends Events {
   EventListenerList get abort();
   EventListenerList get beforeCopy();
   EventListenerList get beforeCut();
   EventListenerList get beforePaste();
   EventListenerList get blur();
   EventListenerList get change();
   EventListenerList get click();
   EventListenerList get contextMenu();
   EventListenerList get copy();
@@ skipping 161 matching lines @@
   bool matchesSelector([String selectors]);
 
   Future<ElementRect> get rect();
 
   Future<CSSStyleDeclaration> get computedStyle();
 
   Future<CSSStyleDeclaration> getComputedStyle(String pseudoElement);
 
   ElementEvents get on();
 }