Remove hack for handling accessibility action on ARC notifications.

ui/message_center/views/custom_notification_view.cc

Index: ui/message_center/views/custom_notification_view.cc
diff --git a/ui/message_center/views/custom_notification_view.cc b/ui/message_center/views/custom_notification_view.cc
index a648f83614afb3ca42dddeb698fcfd7f6ab7c35d..324db5d5561fd9e7ce09eb1d5c45a2c60223e438 100644
--- a/ui/message_center/views/custom_notification_view.cc
+++ b/ui/message_center/views/custom_notification_view.cc
@@ -156,12 +156,11 @@ void CustomNotificationView::ChildPreferredSizeChanged(View* child) {
     controller()->UpdateNotificationSize(notification_id());
 }
 
-bool CustomNotificationView::OnMousePressed(const ui::MouseEvent& event) {
-  // TODO(yhanada): This hack will be removed when HandleAccessibleAction will
-  // be used for handling click events.
-  if (contents_view_ && contents_view_->OnMousePressed(event))
-    return true;
-  return MessageView::OnMousePressed(event);
+bool CustomNotificationView::HandleAccessibleAction(
+    const ui::AXActionData& action) {
+  if (contents_view_)
+    return contents_view_->HandleAccessibleAction(action);
+  return false;
 }
 
 }  // namespace message_center