Fixed compilation with mingw. Change-Id: I027cedc383efbd215e55a7ddf4e41eb1c368a1ae Reviewed-on: https://chromium-review.googlesource.com/262590 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Jacek Caban <cjacek@gmail.com>