mash: Replace ShelfItemDelegate::CanPin with ShelfItem::pinned_by_policy.

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>
@@ skipping 16 matching lines @@
   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;
   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;
   void Close(ash::ShelfID id) override;
   bool IsOpen(ash::ShelfID id) override;
   bool IsPlatformApp(ash::ShelfID id) override;
   void ActivateApp(const std::string& app_id,
                    ash::LaunchSource source,
                    int event_flags) override;
   void SetLauncherItemImage(ash::ShelfID shelf_id,
@@ skipping 39 matching lines @@
   // 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_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeLauncherControllerMus);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_CONTROLLER_MUS_H_