Fix build break due to bug 522

tool/input_sdk/lib/svg/dart2js/svg_dart2js.dart

Index: tool/input_sdk/lib/svg/dart2js/svg_dart2js.dart
diff --git a/tool/input_sdk/lib/svg/dart2js/svg_dart2js.dart b/tool/input_sdk/lib/svg/dart2js/svg_dart2js.dart
index e15ec4f7d7458598035b46612adcd4dd80fdf01a..d709f46ab87ecd3506ee5014cffbd47f38e9d872 100644
--- a/tool/input_sdk/lib/svg/dart2js/svg_dart2js.dart
+++ b/tool/input_sdk/lib/svg/dart2js/svg_dart2js.dart
@@ -4804,6 +4804,7 @@ class SvgElement extends Element implements GlobalEventHandlers {
   // To suppress missing implicit constructor warnings.
   factory SvgElement._() { throw new UnsupportedError("Not supported"); }
 
+/* TODO(vsm): see bug 522 which requires us to comment out this code.
   @DomName('SVGElement.abortEvent')
   @DocsEditable()
   @Experimental() // untriaged
@@ -5063,6 +5064,8 @@ class SvgElement extends Element implements GlobalEventHandlers {
   @DocsEditable()
   @Experimental() // untriaged
   static const EventStreamProvider<Event> waitingEvent = const EventStreamProvider<Event>('waiting');
+  */
+
   /**
    * Constructor instantiated by the DOM when a custom element has been created.
    *