Use ChromeLauncherControllerImpl::GetItem; cleanup.

chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.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/chrome_launcher_controller_mus.h"
 
 #include "base/strings/string_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/ash/chrome_launcher_prefs.h"
@@ skipping 51 matching lines @@
 }
 
 ash::ShelfID ChromeLauncherControllerMus::CreateAppLauncherItem(
     LauncherItemController* controller,
     const std::string& app_id,
     ash::ShelfItemStatus status) {
   NOTIMPLEMENTED();
   return ash::TYPE_UNDEFINED;
 }
 
-const ash::ShelfItem& ChromeLauncherControllerMus::GetItem(
+const ash::ShelfItem* ChromeLauncherControllerMus::GetItem(
     ash::ShelfID id) const {
   NOTIMPLEMENTED();
-  return fake_item_;
+  return nullptr;
 }
 
 void ChromeLauncherControllerMus::SetItemType(ash::ShelfID id,
                                               ash::ShelfItemType type) {
   NOTIMPLEMENTED();
 }
 
 void ChromeLauncherControllerMus::SetItemStatus(ash::ShelfID id,
                                                 ash::ShelfItemStatus status) {
   NOTIMPLEMENTED();
@@ skipping 229 matching lines @@
     app_id_to_item_delegate_.insert(
         std::make_pair(app_id, std::move(delegate)));
 
     AppIconLoader* app_icon_loader = GetAppIconLoaderForApp(app_id);
     if (app_icon_loader) {
       app_icon_loader->FetchImage(app_id);
       app_icon_loader->UpdateImage(app_id);
     }
   }
 }