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This reverts the improvements introduced in
https://chromium-review.googlesource.com/c/chromium/src/+/1183495 on
iOS 13 due to a UIKit bug. This way, swiping on the system keyboard
does not hang the app and the keyboard. However, bugs 875918,873544
are regressing.

Bug: 988431, 875918, 873544
Change-Id: I91f358d80531d17104ffc6db96d4a488864325a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1722545Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Auto-Submit: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682196}