Use ChromeLauncherControllerImpl::GetItem; cleanup.

chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_CONTROLLER_MUS_H_
 #define CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_CONTROLLER_MUS_H_
 
 #include <map>
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
 
 class ChromeShelfItemDelegate;
 
 class ChromeLauncherControllerMus : public ChromeLauncherController {
  public:
   ChromeLauncherControllerMus();
   ~ChromeLauncherControllerMus() override;
 
   // ChromeLauncherController:
   void Init() override;
   ash::ShelfID CreateAppLauncherItem(LauncherItemController* controller,
                                      const std::string& app_id,
                                      ash::ShelfItemStatus status) override;
-  const ash::ShelfItem& GetItem(ash::ShelfID id) const override;
+  const ash::ShelfItem* GetItem(ash::ShelfID id) const override;
   void SetItemType(ash::ShelfID id, ash::ShelfItemType type) override;
   void SetItemStatus(ash::ShelfID id, ash::ShelfItemStatus status) override;
   void SetItemController(ash::ShelfID id,
                          LauncherItemController* controller) override;
   void CloseLauncherItem(ash::ShelfID id) override;
   void Pin(ash::ShelfID id) override;
   void Unpin(ash::ShelfID id) override;
   bool IsPinned(ash::ShelfID id) override;
   void TogglePinned(ash::ShelfID id) override;
   bool IsPinnable(ash::ShelfID id) const override;
@@ skipping 48 matching lines @@
   void OnAppImageUpdated(const std::string& app_id,
                          const gfx::ImageSkia& image) override;
 
  private:
   // Pin the items set in the current profile's preferences.
   void PinAppsFromPrefs();
 
   std::map<std::string, std::unique_ptr<ChromeShelfItemDelegate>>
       app_id_to_item_delegate_;
 
-  // A fake item used for the unimplemented GetItem() override.
-  const ash::ShelfItem fake_item_;
-
   DISALLOW_COPY_AND_ASSIGN(ChromeLauncherControllerMus);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_CONTROLLER_MUS_H_