[Autofill Assistant] Split DetailsCoordinator into Coordinator + ViewBinder.

Change-Id: I3e9579e7e0fdf3bb90e1a6d806045a6a1207a230
Reviewed-on: https://chromium-review.googlesource.com/c/1430009
Commit-Queue: Jordan Demeulenaere <jdemeulenaere@chromium.org>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625361}
3 files changed