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This CL adds support for inheriting the autocapitalize attribute from a form
owner as described in the new spec for autocapitalize:
https://html.spec.whatwg.org/multipage/interaction.html#autocapitalization

This CL also adds tests for this new behavior.

Bug: 776618
Change-Id: Ib96354fb320736255369bd2df3113e172dfdb42e
Reviewed-on: https://chromium-review.googlesource.com/872090Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Ryan Landay <rlanday@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532020}