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

ui/aura/test/test_event_handler.cc

Index: ui/aura/test/test_event_handler.cc
diff --git a/ui/aura/test/test_event_handler.cc b/ui/aura/test/test_event_handler.cc
index dac45cce653545d593fc760d0ac0c0b472052656..910b3018b3fc0ce6ca8c6eda70becf5565733b92 100644
--- a/ui/aura/test/test_event_handler.cc
+++ b/ui/aura/test/test_event_handler.cc
@@ -35,14 +35,12 @@ ui::EventResult TestEventHandler::OnMouseEvent(ui::MouseEvent* event) {
   return ui::ER_UNHANDLED;
 }
 
-ui::EventResult TestEventHandler::OnScrollEvent(ui::ScrollEvent* event) {
+void TestEventHandler::OnScrollEvent(ui::ScrollEvent* event) {
   num_scroll_events_++;
-  return ui::ER_UNHANDLED;
 }
 
-ui::EventResult TestEventHandler::OnTouchEvent(ui::TouchEvent* event) {
+void TestEventHandler::OnTouchEvent(ui::TouchEvent* event) {
   num_touch_events_++;
-  return ui::ER_UNHANDLED;
 }
 
 void TestEventHandler::OnGestureEvent(ui::GestureEvent* event) {