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

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index 48d7f24c1a1a952111e99e4b5874e3a73c2814a8..4ecf46b19ca18948e66c315c56b94fcc1d2bdaa8 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -1173,15 +1173,15 @@ void Widget::OnMouseCaptureLost() {
   is_mouse_button_pressed_ = false;
 }
 
-ui::EventResult Widget::OnTouchEvent(ui::TouchEvent* event) {
+void Widget::OnTouchEvent(ui::TouchEvent* event) {
   ScopedEvent scoped(this, *event);
-  return static_cast<internal::RootView*>(GetRootView())->
+  static_cast<internal::RootView*>(GetRootView())->
       DispatchTouchEvent(event);
 }
 
-ui::EventResult Widget::OnScrollEvent(ui::ScrollEvent* event) {
+void Widget::OnScrollEvent(ui::ScrollEvent* event) {
   ScopedEvent scoped(this, *event);
-  return static_cast<internal::RootView*>(GetRootView())->
+  static_cast<internal::RootView*>(GetRootView())->
       DispatchScrollEvent(event);
 }