bool OmniboxEditModel::CommitSuggestedText() {
  const base::string16 suggestion = view_->GetGrayTextAutocompletion();
  if (suggestion.empty())
    return false;

  const base::string16 final_text = view_->GetText() + suggestion;
  view_->OnBeforePossibleChange();
  view_->SetWindowTextAndCaretPos(final_text, final_text.length(), false,
      false);
  view_->OnAfterPossibleChange();
  return true;
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.