Remove hack for handling accessibility action on ARC notifications.

ui/arc/notification/arc_custom_notification_view.cc

Index: ui/arc/notification/arc_custom_notification_view.cc
diff --git a/ui/arc/notification/arc_custom_notification_view.cc b/ui/arc/notification/arc_custom_notification_view.cc
index 0c8c2ea404313552bb7e8ac750756954ab1e9fad..57c03447773177b2bc22842c18d16fb401c21205 100644
--- a/ui/arc/notification/arc_custom_notification_view.cc
+++ b/ui/arc/notification/arc_custom_notification_view.cc
@@ -9,6 +9,7 @@
 #include "base/memory/ptr_util.h"
 #include "components/exo/notification_surface.h"
 #include "components/exo/surface.h"
+#include "ui/accessibility/ax_action_data.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/compositor/layer_animation_observer.h"
@@ -624,18 +625,9 @@ views::FocusTraversable* ArcCustomNotificationView::GetFocusTraversable() {
   return nullptr;
 }
 
-bool ArcCustomNotificationView::OnMousePressed(const ui::MouseEvent& event) {
-  // TODO(yhanada): Remove this hack as soon as possible after letting
-  // accessible actions be delivered to this view.
-  // All mouse clicks or touches should be sent to corresponding Android view
-  // because the surface is on this view, so receiving a mouse pressed event
-  // means the event is generated by automation API.
-  // We can distinguish events from automation API by checking the target of the
-  // event because the target of all events generated by automation API is set
-  // to nullptr.
-  if (event.IsOnlyLeftMouseButton() && item_ &&
-      item_->expand_state() != mojom::ArcNotificationExpandState::FIXED_SIZE &&
-      event.target() == nullptr) {
+bool ArcCustomNotificationView::HandleAccessibleAction(
+    const ui::AXActionData& action_data) {
+  if (item_ && action_data.action == ui::AX_ACTION_DO_DEFAULT) {
     item_->ToggleExpansion();
     return true;
   }