Revert of mash: Remove ChromeLauncherController's |id_to_item_controller_map_|.

chrome/browser/ui/ash/launcher/arc_app_window_launcher_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_controller.h"
 
 #include <string>
 
 #include "ash/common/shelf/shelf_delegate.h"
-#include "ash/common/shelf/shelf_model.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_window.h"
 #include "ash/display/screen_orientation_controller_chromeos.h"
 #include "ash/shared/app_types.h"
 #include "ash/shell.h"
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_state_aura.h"
 #include "ash/wm/window_util.h"
 #include "base/bind.h"
@@ skipping 633 matching lines @@
 
   std::unique_ptr<ArcAppWindowLauncherItemController> controller =
       base::MakeUnique<ArcAppWindowLauncherItemController>(
           app_shelf_id.ToString());
   ArcAppWindowLauncherItemController* item_controller = controller.get();
   const ash::ShelfID shelf_id =
       shelf_delegate_->GetShelfIDForAppID(app_shelf_id.ToString());
   if (!shelf_id) {
     owner()->CreateAppLauncherItem(std::move(controller), ash::STATUS_RUNNING);
   } else {
-    ash::ShelfModel* shelf_model = ash::Shell::Get()->shelf_model();
-    shelf_model->SetShelfItemDelegate(shelf_id, std::move(controller));
+    owner()->SetShelfItemDelegate(shelf_id, std::move(controller));
     owner()->SetItemStatus(shelf_id, ash::STATUS_RUNNING);
   }
   item_controller->AddTaskId(task_id);
   app_shelf_group_to_controller_map_[app_shelf_id] = item_controller;
   return item_controller;
 }
 
 void ArcAppWindowLauncherController::RegisterApp(
     AppWindowInfo* app_window_info) {
   AppWindow* app_window = app_window_info->app_window();
@@ skipping 62 matching lines @@
   const std::string arc_app_id = exo::ShellSurface::GetApplicationId(window);
   if (arc_app_id.empty())
     return -1;
 
   int task_id = -1;
   if (sscanf(arc_app_id.c_str(), "org.chromium.arc.%d", &task_id) != 1)
     return -1;
 
   return task_id;
 }