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Since the pin pad buttons are no more tabbable
(see for more details: https://crbug.com/1043194)
we can return focus to textfield on number insert.

Bug: 1009417
Change-Id: I4b1ebeef0a8e32a5ff2ba9b39da3ee424b7bdb3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208864Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Roman Aleksandrov <raleksandrov@google.com>
Cr-Commit-Position: refs/heads/master@{#774346}