Use ChromeLauncherControllerImpl::GetItem; cleanup.

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

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.h
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.h b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.h
index ddeacd89d6614ff55ea4c0665c0cb53ac4fd9170..be14e0209aab50f523c15f3df7489c943d0657cd 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.h
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.h
@@ -24,7 +24,7 @@ class ChromeLauncherControllerMus : public ChromeLauncherController {
   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,
@@ -93,9 +93,6 @@ class ChromeLauncherControllerMus : public ChromeLauncherController {
   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);
 };