Hide save password section when search bar is active.

This CL removes the "save password" section(header and switch item) in
PasswordsTableViewController before the search bar is presented and adds
them back before the search bar is dismissed.

Bug: 894791
Change-Id: I1acb84de590157a57a8d0a95b6ac43b1641a16b1
Reviewed-on: https://chromium-review.googlesource.com/c/1425612
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633669}
3 files changed