This reverts commit 89ba65fd.

Reason: crash in v8.detached_context_age_in_gc benchmark.

BUG=chromium:450824
LOG=NO
NOTRY=true
NOTREECHECKS=true
TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1034203002

Cr-Commit-Position: refs/heads/master@{#27483}