Extract kArcEnabled preference from ArcSessionManager part 2.

chrome/browser/ui/app_list/arc/arc_app_test.h

Index: chrome/browser/ui/app_list/arc/arc_app_test.h
diff --git a/chrome/browser/ui/app_list/arc/arc_app_test.h b/chrome/browser/ui/app_list/arc/arc_app_test.h
index 077510bd8c3626bcef645b7b1763e738636f175e..8163acd7ff51dcd358fd6fc302f6423ffb11d30b 100644
--- a/chrome/browser/ui/app_list/arc/arc_app_test.h
+++ b/chrome/browser/ui/app_list/arc/arc_app_test.h
@@ -17,6 +17,7 @@ namespace mojom {
 class AppInfo;
 class ArcPackageInfo;
 }
+class ArcPlayStoreEnabledPreferenceHandler;
 class ArcServiceManager;
 class ArcSessionManager;
 class FakeAppInstance;
@@ -96,6 +97,8 @@ class ArcAppTest {
 
   std::unique_ptr<arc::ArcServiceManager> arc_service_manager_;
   std::unique_ptr<arc::ArcSessionManager> arc_session_manager_;
+  std::unique_ptr<arc::ArcPlayStoreEnabledPreferenceHandler>
+      arc_play_store_enabled_preference_handler_;
   std::unique_ptr<arc::FakeAppInstance> app_instance_;
 
   std::unique_ptr<chromeos::ScopedUserManagerEnabler> user_manager_enabler_;