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

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 9a0888f83ce2ed2a321e9b1f04ba0c3c16c8df36..5e232c9a3cb51461a282c0a9bc9b657bdb32c450 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
@@ -73,7 +73,6 @@ class ChromeLauncherControllerImpl
   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;
@@ -203,6 +202,9 @@ class ChromeLauncherControllerImpl
   // Schedules re-sync of shelf model.
   void ScheduleUpdateAppLaunchersFromPref();
 
+  // Update the policy-pinned flag for each shelf item.
+  void UpdatePolicyPinnedAppsFromPrefs();
+
   // Sets whether the virtual keyboard is enabled from prefs.
   void SetVirtualKeyboardBehaviorFromPrefs();