[cros] check for updates in WebUI OOBE can be cancelled in dev builds.

chrome/browser/chromeos/login/mock_update_screen.h

Index: chrome/browser/chromeos/login/mock_update_screen.h
diff --git a/chrome/browser/chromeos/login/mock_update_screen.h b/chrome/browser/chromeos/login/mock_update_screen.h
index 3a65a8e5964cfee17f8248503672e790431317b9..0255eca56b247198e1cd4a398f76e24e8f03aa68 100644
--- a/chrome/browser/chromeos/login/mock_update_screen.h
+++ b/chrome/browser/chromeos/login/mock_update_screen.h
@@ -26,6 +26,9 @@ class MockUpdateScreenActor : public UpdateScreenActor {
   MockUpdateScreenActor();
   virtual ~MockUpdateScreenActor();
 
+  virtual void SetDelegate(UpdateScreenActor::Delegate* screen) OVERRIDE;
+
+  MOCK_METHOD1(MockSetDelegate, void(UpdateScreenActor::Delegate* screen));
   MOCK_METHOD0(Show, void());
   MOCK_METHOD0(Hide, void());
   MOCK_METHOD0(PrepareToShow, void());
@@ -33,6 +36,9 @@ class MockUpdateScreenActor : public UpdateScreenActor {
   MOCK_METHOD1(SetProgress, void(int progress));
   MOCK_METHOD1(ShowCurtain, void(bool enable));
   MOCK_METHOD1(ShowPreparingUpdatesInfo, void(bool enable));
+
+ private:
+  UpdateScreenActor::Delegate* screen_;
 };
 
 }  // namespace chromeos