[iOS][Translate] Cleans up Compact Translate Infobar feature flag

Bug: 910994
Change-Id: Id3ede5d9c6f4f31264ec8c19c6db0e94ef4c314d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1639329
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#669373}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5603a2446a32aa827c997d267400a6539071cb89
27 files changed