mash: Use mojo for ShelfItemDelegate and [app] MenuItem.

chrome/browser/ui/ash/launcher/launcher_item_controller.cc

Index: chrome/browser/ui/ash/launcher/launcher_item_controller.cc
diff --git a/chrome/browser/ui/ash/launcher/launcher_item_controller.cc b/chrome/browser/ui/ash/launcher/launcher_item_controller.cc
index 99f4b11adb35f883d06c5ee5e28244b3a1d9a412..8c45931360d16b9688b7155f7f7f1c2fba713252 100644
--- a/chrome/browser/ui/ash/launcher/launcher_item_controller.cc
+++ b/chrome/browser/ui/ash/launcher/launcher_item_controller.cc
@@ -20,6 +20,11 @@ LauncherItemController::LauncherItemController(
 
 LauncherItemController::~LauncherItemController() {}
 
+std::vector<ash::mojom::MenuItemPtr> LauncherItemController::GetAppMenuItems(
+    int event_flags) {
+  return std::vector<ash::mojom::MenuItemPtr>();
+}
+
 AppWindowLauncherItemController*
 LauncherItemController::AsAppWindowLauncherItemController() {
   return nullptr;