GitLab

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/970582Reviewed-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}