arc: ARC loading progress should not be shown when started from OOBE.

chrome/browser/ui/webui/chromeos/login/arc_terms_of_service_screen_handler.h

Index: chrome/browser/ui/webui/chromeos/login/arc_terms_of_service_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/arc_terms_of_service_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/arc_terms_of_service_screen_handler.h
index 0b171707a2500192d40643ef1867f6fa8b8fbcad..bd0a1f3363ac06dc10bfb2fd39b361ddd87c6f30 100644
--- a/chrome/browser/ui/webui/chromeos/login/arc_terms_of_service_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/arc_terms_of_service_screen_handler.h
@@ -9,6 +9,7 @@
 #include <string>
 
 #include "base/macros.h"
+#include "base/observer_list.h"
 #include "chrome/browser/chromeos/arc/optin/arc_optin_preference_handler_observer.h"
 #include "chrome/browser/chromeos/login/screens/arc_terms_of_service_screen_actor.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
@@ -38,7 +39,8 @@ class ArcTermsOfServiceScreenHandler :
       ::login::LocalizedValuesBuilder* builder) override;
 
   // ArcTermsOfServiceScreenActor:
-  void SetDelegate(Delegate* screen) override;
+  void AddObserver(ArcTermsOfServiceScreenActorObserver* observer) override;
+  void RemoveObserver(ArcTermsOfServiceScreenActorObserver* observer) override;
   void Show() override;
   void Hide() override;
 
@@ -60,7 +62,8 @@ class ArcTermsOfServiceScreenHandler :
   void OnBackupAndRestoreModeChanged(bool enabled, bool managed) override;
   void OnLocationServicesModeChanged(bool enabled, bool managed) override;
 
-  Delegate* screen_ = nullptr;
+  base::ObserverList<ArcTermsOfServiceScreenActorObserver, true>
+  observer_list_;
 
   // Whether the screen should be shown right after initialization.
   bool show_on_init_ = false;