Also remove dead code in Tokenizer.l

BUG=chromium:668842

Change-Id: Ice18313a64f0bb2242299993bfaa882a6578ad54
Reviewed-on: https://chromium-review.googlesource.com/435042Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>