Remove LauncherItemController::Launch, cleanup.

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

Index: chrome/browser/ui/ash/launcher/arc_app_deferred_launcher_item_controller.cc
diff --git a/chrome/browser/ui/ash/launcher/arc_app_deferred_launcher_item_controller.cc b/chrome/browser/ui/ash/launcher/arc_app_deferred_launcher_item_controller.cc
index f16a57bae34c9fbc2f0ee5dd15d80639c2b912fd..dbeb045297641e392eda5a2265b39650971a20c1 100644
--- a/chrome/browser/ui/ash/launcher/arc_app_deferred_launcher_item_controller.cc
+++ b/chrome/browser/ui/ash/launcher/arc_app_deferred_launcher_item_controller.cc
@@ -18,7 +18,7 @@ ArcAppDeferredLauncherItemController::ArcAppDeferredLauncherItemController(
     ChromeLauncherController* controller,
     int event_flags,
     const base::WeakPtr<ArcAppDeferredLauncherController>& host)
-    : LauncherItemController(arc_app_id, "", controller),
+    : LauncherItemController(arc_app_id, std::string(), controller),
       event_flags_(event_flags),
       host_(host),
       start_time_(base::Time::Now()) {}
@@ -47,9 +47,6 @@ void ArcAppDeferredLauncherItemController::Close() {
     host_->Close(app_id());
 }
 
-void ArcAppDeferredLauncherItemController::Launch(ash::LaunchSource source,
-                                                  int event_flags) {}
-
 ash::ShelfItemDelegate::PerformedAction
 ArcAppDeferredLauncherItemController::Activate(ash::LaunchSource source) {
   return ash::ShelfItemDelegate::kNoAction;