Roll buildtools to d511e4

This roll includes the following 6 revisions:
https://chromium.googlesource.com/chromium/buildtools/+log/5ad14542a6a74dd914f067b948c5d3e8d170396b..d511e4d53d6fc8037badbdf4b225c137e94b52fb

BUG=749077
TBR=thakis@chromium.org

Change-Id: Ib3ceda961fa83e93fed5877d02b3b4b39bcfd9c1
Reviewed-on: https://chromium-review.googlesource.com/594910
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490894}
1 file changed