We have been shipping harmony scoping for 2 Chrome releases now (M41
and M42). Time to remove the flag.

R=rossberg@chromium.org
LOG=Y

Review URL: https://codereview.chromium.org/1007783002

Cr-Commit-Position: refs/heads/master@{#27187}

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/426233002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22709 ce2b1a6d-e550-0410-aec6-3dcde31c8c00