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Due to the fact that we reuse TSF document for text fields with same
input type, we should property reset the state by clearing focus before
re-using the document.

Bug: 1162974
Change-Id: Ia92187705e93cc064e992e28c8638d5647e06ea9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2610147Reviewed-by: Yohei Yukawa <yukawa@chromium.org>
Reviewed-by: Siye Liu <siliu@microsoft.com>
Commit-Queue: Siye Liu <siliu@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#840322}