events: Change gesture-event handler in EventHandler to not return any values.

ui/views/controls/combobox/native_combobox_views.cc

Index: ui/views/controls/combobox/native_combobox_views.cc
diff --git a/ui/views/controls/combobox/native_combobox_views.cc b/ui/views/controls/combobox/native_combobox_views.cc
index 9f67153904b122b656be83d4856e484ec53a8181..8148e285e430232fef558f1b7e413717c06c4297 100644
--- a/ui/views/controls/combobox/native_combobox_views.cc
+++ b/ui/views/controls/combobox/native_combobox_views.cc
@@ -161,13 +161,14 @@ void NativeComboboxViews::OnBlur() {
 /////////////////////////////////////////////////////////////////
 // NativeComboboxViews, ui::EventHandler overrides:
 
-ui::EventResult NativeComboboxViews::OnGestureEvent(ui::GestureEvent* gesture) {
+void NativeComboboxViews::OnGestureEvent(ui::GestureEvent* gesture) {
   if (gesture->type() == ui::ET_GESTURE_TAP) {
     UpdateFromModel();
     ShowDropDownMenu();
-    return ui::ER_CONSUMED;
+    gesture->StopPropagation();
+    return;
   }
-  return View::OnGestureEvent(gesture);
+  View::OnGestureEvent(gesture);
 }
 
 /////////////////////////////////////////////////////////////////