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

ui/app_list/contents_view.cc

Index: ui/app_list/contents_view.cc
diff --git a/ui/app_list/contents_view.cc b/ui/app_list/contents_view.cc
index 6d9a2e86af432af3cee5d3d30c564179e06c2b58..28ab70697f8b0255532465073e8900232002b01d 100644
--- a/ui/app_list/contents_view.cc
+++ b/ui/app_list/contents_view.cc
@@ -219,18 +219,18 @@ void ContentsView::OnGestureEvent(ui::GestureEvent* event) {
   }
 }
 
-ui::EventResult ContentsView::OnScrollEvent(ui::ScrollEvent* event) {
+void ContentsView::OnScrollEvent(ui::ScrollEvent* event) {
   if (show_state_ != SHOW_APPS ||
       event->type() == ui::ET_SCROLL_FLING_CANCEL ||
       abs(event->x_offset()) < kMinScrollToSwitchPage) {
-    return ui::ER_UNHANDLED;
+    return;
   }
 
   if (!pagination_model_->has_transition()) {
     pagination_model_->SelectPageRelative(event->x_offset() > 0 ? -1 : 1,
                                           true);
   }
-  return ui::ER_HANDLED;
+  event->SetHandled();
 }
 
 }  // namespace app_list