Do not try to pop up the account chooser if there is no browser window.

chrome/browser/ui/passwords/manage_passwords_ui_controller.cc

Index: chrome/browser/ui/passwords/manage_passwords_ui_controller.cc
diff --git a/chrome/browser/ui/passwords/manage_passwords_ui_controller.cc b/chrome/browser/ui/passwords/manage_passwords_ui_controller.cc
index f73ebcde8f0aefd5640aafa772879fa5e0393feb..beb3495ebe9156e24fe8c5212d1a5c316036d23e 100644
--- a/chrome/browser/ui/passwords/manage_passwords_ui_controller.cc
+++ b/chrome/browser/ui/passwords/manage_passwords_ui_controller.cc
@@ -100,6 +100,8 @@ bool ManagePasswordsUIController::OnChooseCredentials(
     const GURL& origin,
     const ManagePasswordsState::CredentialsCallback& callback) {
   DCHECK(!local_credentials.empty() || !federated_credentials.empty());
+  if (!HasBrowserWindow())
+    return false;
   PasswordDialogController::FormsVector locals =
       CopyFormVector(local_credentials);
   PasswordDialogController::FormsVector federations =
@@ -413,6 +415,10 @@ AutoSigninFirstRunPrompt* ManagePasswordsUIController::CreateAutoSigninPrompt(
   return CreateAutoSigninPromptView(controller, web_contents());
 }
 
+bool ManagePasswordsUIController::HasBrowserWindow() const {
+  return chrome::FindBrowserWithWebContents(web_contents()) != nullptr;
+}
+
 void ManagePasswordsUIController::DidNavigateMainFrame(
     const content::LoadCommittedDetails& details,
     const content::FrameNavigateParams& params) {