Implement the new Sync Confirmation dialog on Linux and Windows.

components/signin/core/browser/fake_signin_manager.cc

Index: components/signin/core/browser/fake_signin_manager.cc
diff --git a/components/signin/core/browser/fake_signin_manager.cc b/components/signin/core/browser/fake_signin_manager.cc
index ab631a9b6f80cefcd373e17542541a71317d7074..cabf4aa6f8afafa33fc3d93568c6a265a960771f 100644
--- a/components/signin/core/browser/fake_signin_manager.cc
+++ b/components/signin/core/browser/fake_signin_manager.cc
@@ -42,6 +42,9 @@ void FakeSigninManager::StartSignInWithRefreshToken(
   set_password(password);
   username_ = username;
 
+  possibly_invalid_gaia_id_.assign(gaia_id);
+  possibly_invalid_email_.assign(username);
+
   if (!oauth_fetched_callback.is_null())
     oauth_fetched_callback.Run(refresh_token);
 }