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

client/html/src/Element.dart

Index: client/html/src/Element.dart
diff --git a/client/html/src/Element.dart b/client/html/src/Element.dart
index b91104a6507a944903c0991c200927435664f793..4709d777f4554b8f44cd749e0a35dffd39abfcfc 100644
--- a/client/html/src/Element.dart
+++ b/client/html/src/Element.dart
@@ -12,14 +12,6 @@ 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();