mash: Refactor ChromeLauncherController's ShelfDelegate code.

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

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
index 6c032f9623871a01c1056e2ef35cf0705f444c7f..cfdc39664c96d6fb66381c51e16b9868ca8dcd6f 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
@@ -69,10 +69,7 @@ class ChromeLauncherControllerImpl
   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;
   void LockV1AppWithID(const std::string& app_id) override;
   void UnlockV1AppWithID(const std::string& app_id) override;
   void Launch(ash::ShelfID id, int event_flags) override;
@@ -133,7 +130,6 @@ class ChromeLauncherControllerImpl
   ash::ShelfID GetShelfIDForAppIDAndLaunchID(
       const std::string& app_id,
       const std::string& launch_id) override;
-  bool HasShelfIDToAppIDMapping(ash::ShelfID id) const override;
   const std::string& GetAppIDForShelfID(ash::ShelfID id) override;
   void PinAppWithID(const std::string& app_id) override;
   bool IsAppPinned(const std::string& app_id) override;
@@ -271,9 +267,8 @@ class ChromeLauncherControllerImpl
   // sync_preferences::PrefServiceSyncableObserver:
   void OnIsSyncingChanged() override;
 
-  // Unpins shelf item and optionally updates pin prefs when |update_prefs| is
-  // set to true.
-  void UnpinAndUpdatePrefs(ash::ShelfID id, bool update_prefs);
+  // An internal helper to unpin a shelf item; this does not update prefs.
+  void UnpinShelfItemInternal(ash::ShelfID id);
 
   ash::ShelfModel* model_;