Remove LauncherItemController::Launch, cleanup.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/ash/launcher/arc_app_window_launcher_item_controller.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/app_list/arc/arc_app_list_prefs.h"
 #include "chrome/browser/ui/app_list/arc/arc_app_utils.h"
 #include "chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item_v2app.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
 #include "chrome/browser/ui/ash/launcher/launcher_controller_helper.h"
 #include "ui/aura/window.h"
 #include "ui/base/base_window.h"
 
 ArcAppWindowLauncherItemController::ArcAppWindowLauncherItemController(
     const std::string& arc_app_id,
     ChromeLauncherController* controller)
-    : AppWindowLauncherItemController(arc_app_id, "", controller) {}
+    : AppWindowLauncherItemController(arc_app_id, std::string(), controller) {}
 
 ArcAppWindowLauncherItemController::~ArcAppWindowLauncherItemController() {}
 
 void ArcAppWindowLauncherItemController::AddTaskId(int task_id) {
   task_ids_.insert(task_id);
 }
 
 void ArcAppWindowLauncherItemController::RemoveTaskId(int task_id) {
   task_ids_.erase(task_id);
 }
@@ skipping 26 matching lines @@
     size_t i = std::distance(windows().begin(), it);
     gfx::Image image;
     aura::Window* window = (*it)->GetNativeWindow();
     items.push_back(base::MakeUnique<ChromeLauncherAppMenuItemV2App>(
         ((window && !window->GetTitle().empty()) ? window->GetTitle()
                                                  : app_title),
         &image, app_id(), launcher_controller(), i));
   }
   return items;
 }