Do not show the update bubble for sync credentials when a username is unknown.

components/password_manager/core/browser/password_form_manager.cc

Index: components/password_manager/core/browser/password_form_manager.cc
diff --git a/components/password_manager/core/browser/password_form_manager.cc b/components/password_manager/core/browser/password_form_manager.cc
index 4c82699add8cb06066c625d7f3ffc2397cd3dccd..ac7f3588cd54137b1b25b022cabfe655d4f4d3a1 100644
--- a/components/password_manager/core/browser/password_form_manager.cc
+++ b/components/password_manager/core/browser/password_form_manager.cc
@@ -1018,13 +1018,6 @@ void PasswordFormManager::CreatePendingCredentials() {
 
   if (has_generated_password_)
     pending_credentials_.type = PasswordForm::TYPE_GENERATED;
-
-  // In case of change password forms we need to leave
-  // |provisionally_saved_form_| in order to be able to determine which field is
-  // password and which is a new password during sending a vote in other cases
-  // we can reset |provisionally_saved_form_|.
-  if (!provisionally_saved_form_->IsPossibleChangePasswordForm())
-    provisionally_saved_form_.reset();
 }
 
 uint32_t PasswordFormManager::ScoreResult(const PasswordForm& candidate) const {