mash: Move AutoHideEventHandler to WmShelfAura.

ash/shelf/shelf_widget.cc

Index: ash/shelf/shelf_widget.cc
diff --git a/ash/shelf/shelf_widget.cc b/ash/shelf/shelf_widget.cc
index f67d85e0fd86989046541aa905e76360989fbf5f..e20f34553f9362fa9397a0bb7e7ca1ee7cb4c5ed 100644
--- a/ash/shelf/shelf_widget.cc
+++ b/ash/shelf/shelf_widget.cc
@@ -21,7 +21,6 @@
 #include "ash/shelf/dimmer_view.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_layout_manager.h"
-#include "ash/shell.h"
 #include "ash/wm/status_area_layout_manager.h"
 #include "ash/wm/workspace_controller.h"
 #include "base/memory/ptr_util.h"
@@ -519,16 +518,4 @@ void ShelfWidget::WillDeleteShelfLayoutManager() {
   shelf_layout_manager_ = nullptr;
 }
 
-void ShelfWidget::OnMouseEvent(ui::MouseEvent* event) {
-  Widget::OnMouseEvent(event);
-  if (Shell::GetInstance()->in_mus() && shelf_layout_manager_)
-    shelf_layout_manager_->UpdateAutoHideForMouseEvent(event);
-}
-
-void ShelfWidget::OnGestureEvent(ui::GestureEvent* event) {
-  Widget::OnGestureEvent(event);
-  if (Shell::GetInstance()->in_mus() && shelf_layout_manager_)
-    shelf_layout_manager_->UpdateAutoHideForGestureEvent(event);
-}
-
 }  // namespace ash