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This reverts commit cb950738.

Reason for revert: suspected of performance regression: crbug.com/825005

Original change's description:
> Fixed more Document leaks in Autofill
> 
> Some Autofill-related code can hold persistent reference to last
> changed or focused <input> element that cause leak of whole Documents
> containing such element after navigation to other page.
> 
> Some leaks fixed in https://chromium-review.googlesource.com/939224
> This CL fixes other related leaks.
> 
> Bug: 734427
> Change-Id: Ic084d0670cccb9d11595d0bde8cf0d605bfa8911
> Reviewed-on: https://chromium-review.googlesource.com/970582
> Reviewed-by: Evan Stade <estade@chromium.org>
> Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
> Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#544404}

TBR=estade@chromium.org,dvadym@chromium.org,atimoxin@yandex-team.ru

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 734427
Change-Id: I57bd57e50af5d8e4f4d97b731a354fd7b0957966
Reviewed-on: https://chromium-review.googlesource.com/981292Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546146}