fix: auth required websocket crash (#48539)

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

Author: trop[bot]

shell/browser/net/proxying_websocket.cc

@@ -401,7 +401,7 @@ void ProxyingWebSocket::OnHeadersReceivedCompleteForAuth(
 
   auto continuation = base::BindRepeating(
       &ProxyingWebSocket::OnAuthRequiredComplete, weak_factory_.GetWeakPtr());
-  auto auth_rv = AuthRequiredResponse::kIoPending;
+  auto auth_rv = AuthRequiredResponse::kCancelAuth;
   PauseIncomingMethodCallProcessing();
 
   OnAuthRequiredComplete(auth_rv);