This flag has been flipped off since 52, so it is due for removal.

R=adamk@chromium.org,caitp@igalia.com
BUG=v8:3785
CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_linux_noi18n_rel_ng

Review-Url: https://codereview.chromium.org/2268633002
Cr-Commit-Position: refs/heads/master@{#39435}