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Experiment caused problems on iOS 12 and 14. On iOS 12 input accessory
views had a bug where they were not being added most of the time. On
iOS14 a divergence on some usage was observed in UMA, but there is no
clear explanation for this.

Bug: 816427
Change-Id: I98441836d208a30e5ea270c84e23f50b320eba52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2565696Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Javier Flores <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832360}