GitLab

- |ignore_text_changes_| was not used anywhere.
- |provisionally_saved_form_| was a std::unique_ptr<FormData> only to
  model optionality.

Bug: 1007974
Change-Id: I1369b1d98e639acb8068ef7c5e51bc494a6b43ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036061Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Commit-Queue: Christoph Schwering <schwering@google.com>
Cr-Commit-Position: refs/heads/master@{#738189}