events: Update scroll and touch handlers to not return EventResult.

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 c87692db4b8dcd8fdb7b84478739b0cab628802d..1ee1b26099d4c042561d1ab1d5336a2043eb9ce6 100644
--- a/ui/views/widget/root_view.h
+++ b/ui/views/widget/root_view.h
@@ -62,8 +62,8 @@ class VIEWS_EXPORT RootView : public View, public FocusTraversable {
   // path, and finally to the default keyboard handler, until someone consumes
   // it. Returns whether anyone consumed the event.
   ui::EventResult DispatchKeyEvent(const ui::KeyEvent& event);
-  ui::EventResult DispatchScrollEvent(ui::ScrollEvent* event);
-  ui::EventResult DispatchTouchEvent(ui::TouchEvent* event);
+  void DispatchScrollEvent(ui::ScrollEvent* event);
+  void DispatchTouchEvent(ui::TouchEvent* event);
   virtual void DispatchGestureEvent(ui::GestureEvent* event);
 
   // Focus ---------------------------------------------------------------------