Flex version is 2.6.4
Bison version is 3.0.4

BUG=chromium:668842

Change-Id: Ia05ae338c9b9e588534f8346ff5c59ed747c56bf
Reviewed-on: https://chromium-review.googlesource.com/435553Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>