[iOS] Ensure CBD don’t gets two footer

R=jlebel

Fixed: 1356395
Change-Id: I482319ccfcf405ff52aa2b695a99fc45129e902f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3855482


Auto-Submit: Arthur Milchior <arthurmilchior@google.com>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1039260}