Stop using gitdeps to fetch our dependencies

This script do shallow checkouts of some stuff in the Chrome repo, which
isn't really supported by Gerrit.

Bug: 759092
Change-Id: I17526aa71d8059f2b1ab4bc1a464e2136a532158
Reviewed-on: https://chromium-review.googlesource.com/809608
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
4 files changed