arc: Dont sync app list change caused by Arc opt out.

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 dbffd9e264e27b7ef31d8dbb27b5fd291d0ca682..e86559e423853f26248ba743b19d22425819a3a5 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h
@@ -210,7 +210,7 @@ class ChromeLauncherControllerImpl
   // Internal helpers for pinning and unpinning that handle both
   // client-triggered and internal pinning operations.
   void DoPinAppWithID(const std::string& app_id);
-  void DoUnpinAppWithID(const std::string& app_id);
+  void DoUnpinAppWithID(const std::string& app_id, bool sync_change);
 
   // Pin a running app with |shelf_id| internally to |index|. It returns
   // the index where the item was pinned.
@@ -308,6 +308,9 @@ class ChromeLauncherControllerImpl
   // app_list::AppListSyncableService::Observer:
   void OnSyncModelUpdated() override;
 
+  // Unpins shelf item and optionally sync change.
+  void UnpinAndSync(ash::ShelfID id, bool sync_change);
+
   ash::ShelfModel* model_;
 
   // Profile used for prefs and loading extensions. This is NOT necessarily the