Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/244ad31..39cffda

TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org

Change-Id: I92a7ae51de2eec216a072bfa80413dd5db556948
Reviewed-on: https://chromium-review.googlesource.com/1074560
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53379}