Reason for revert:
Breaks TSAN

Original issue's description:
> Update V8 DEPS.
>
> Rolling v8/build to b02fa16a7e5f43a2afb00b8cf56375a700f3ed0e
>
> Rolling v8/tools/clang to 82fffa46e8fedec2be06199c5f90410e7f2bffb8
>
> Rolling v8/tools/mb to 94f86dcf676fbf08448f662273aac62951365b2c
>
> TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org
>
> Committed: https://crrev.com/a796d69a9a093ca7773acbe9377865b7df680fe6
> Cr-Commit-Position: refs/heads/master@{#38850}

TBR=machenbach@chromium.org,vogelheim@chromium.org,v8-autoroll@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2270293004
Cr-Commit-Position: refs/heads/master@{#38851}