[WIP] Allow scroll events to permanently change the default gesture handler in RootView

ui/views/widget/root_view.h

Index: ui/views/widget/root_view.h
diff --git a/ui/views/widget/root_view.h b/ui/views/widget/root_view.h
index e72bf901731e679c5d9b89badd68c8d62155dbb8..97ce1d5cb2cbbc157b093dc482b30ac941528540 100644
--- a/ui/views/widget/root_view.h
+++ b/ui/views/widget/root_view.h
@@ -188,13 +188,9 @@ class VIEWS_EXPORT RootView : public View,
   int last_mouse_event_y_;
 
   // The view currently handling gesture events. When set, this handler receives
-  // all gesture events, except when there is an event handler for the specific
-  // gesture (e.g. scroll).
+  // all gesture events.
   View* gesture_handler_;
 
-  // The view currently handling scroll gesture events.
-  View* scroll_gesture_handler_;
-
   scoped_ptr<internal::PreEventDispatchHandler> pre_dispatch_handler_;
   scoped_ptr<internal::PostEventDispatchHandler> post_dispatch_handler_;