GitLab

This CL:
* Adds a boolean parameter to AutofillDropdownAdapter to allow us to
  programmatically choose between two visual styles (the existing UI,
  and the WIP visual refresh).
* Removes dividers drawn between items in the refresh case.
* Wires up the existing feature and flag which will control which style
  is used.

Change-Id: Ia7cbb79b31e8ad9d086ef1a9a69cb6090b58d533
Bug: 874077
Reviewed-on: https://chromium-review.googlesource.com/1171558Reviewed-by: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584749}