Remove LauncherItemController::Launch, cleanup.

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

Index: chrome/browser/ui/ash/launcher/launcher_controller_helper.cc
diff --git a/chrome/browser/ui/ash/launcher/launcher_controller_helper.cc b/chrome/browser/ui/ash/launcher/launcher_controller_helper.cc
index 28a0ee2994f429e9055f2b3b96818b73b64689a7..ef0ef130d8438f7d7d0845b54790c45e645eb19f 100644
--- a/chrome/browser/ui/ash/launcher/launcher_controller_helper.cc
+++ b/chrome/browser/ui/ash/launcher/launcher_controller_helper.cc
@@ -170,16 +170,9 @@ bool LauncherControllerHelper::IsValidIDForCurrentUser(
 }
 
 void LauncherControllerHelper::LaunchApp(const std::string& app_id,
+                                         const std::string& launch_id,
                                          ash::LaunchSource source,
                                          int event_flags) {
-  LaunchAppWithLaunchId(app_id, "", source, event_flags);
-}
-
-void LauncherControllerHelper::LaunchAppWithLaunchId(
-    const std::string& app_id,
-    const std::string& launch_id,
-    ash::LaunchSource source,
-    int event_flags) {
   const ArcAppListPrefs* arc_prefs = GetArcAppListPrefs();
   if (arc_prefs && arc_prefs->IsRegistered(app_id)) {
     arc::LaunchApp(profile_, app_id, event_flags);
@@ -225,8 +218,8 @@ ArcAppListPrefs* LauncherControllerHelper::GetArcAppListPrefs() const {
 }
 
 void LauncherControllerHelper::ExtensionEnableFlowFinished() {
-  LaunchApp(extension_enable_flow_->extension_id(), ash::LAUNCH_FROM_UNKNOWN,
-            ui::EF_NONE);
+  LaunchApp(extension_enable_flow_->extension_id(), std::string(),
+            ash::LAUNCH_FROM_UNKNOWN, ui::EF_NONE);
   extension_enable_flow_.reset();
 }