This reverts commit 048a3a3e.

Reason for revert: Break V8 Linux64 GC Stress 

Original change's description:
> [Intl] Cleans up intl-relative-time-format flag
> 
> Cleans up always=true intl-relative-time-format flag
> It shipped in m71 in Dec 2018.
> 
> Bug: v8:8704
> Change-Id: I52d86aea9aedf201a216a1df0773a486fbee37b9
> Reviewed-on: https://chromium-review.googlesource.com/c/1417299
> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58904}

TBR=jshin@chromium.org,gsathya@chromium.org,ftang@chromium.org

Change-Id: I811decf09e2e1e06323eb5a651cd921d669fc4db
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8704
Reviewed-on: https://chromium-review.googlesource.com/c/1420359Reviewed-by: Frank Tang <ftang@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58905}