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The iOS interstitial has its own flag.

Change-Id: Ib101bde967802a0ecdf071c5cc819a23ca3517e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250672Reviewed-by: Livvie Lin <livvielin@chromium.org>
Reviewed-by: Joe DeBlasio <jdeblasio@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779911}