Exclude building signin view controller and its delegate on ChromeOS

chrome/browser/ui/webui/signin/sync_confirmation_handler.cc

Index: chrome/browser/ui/webui/signin/sync_confirmation_handler.cc
diff --git a/chrome/browser/ui/webui/signin/sync_confirmation_handler.cc b/chrome/browser/ui/webui/signin/sync_confirmation_handler.cc
index bbb199e5172f52dfd27f31abd5c36d97643f35e5..fcac3f8dc9f4c7a306a0e5d03b2d4dc2ad6c4406 100644
--- a/chrome/browser/ui/webui/signin/sync_confirmation_handler.cc
+++ b/chrome/browser/ui/webui/signin/sync_confirmation_handler.cc
@@ -71,7 +71,7 @@ void SyncConfirmationHandler::HandleUndo(const base::ListValue* args) {
     SigninManagerFactory::GetForProfile(Profile::FromWebUI(web_ui()))->SignOut(
         signin_metrics::ABORT_SIGNIN,
         signin_metrics::SignoutDelete::IGNORE_METRIC);
-    browser->CloseModalSigninWindow();
+    browser->signin_view_controller()->CloseModalSignin();
   }
 }
 
@@ -110,7 +110,7 @@ void SyncConfirmationHandler::CloseModalSigninWindow(
   if (browser) {
     LoginUIServiceFactory::GetForProfile(browser->profile())->
         SyncConfirmationUIClosed(result);
-    browser->CloseModalSigninWindow();
+    browser->signin_view_controller()->CloseModalSignin();
   }
 }