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This change refactors PasswordsTableViewController, by adding
PasswordsCoordinator. All code related to the presenting/dismissing of
the controllers was moved to the coordinator. Mediator moved to the
coordinator as well. Cleaned includes and deps.

Bug: 1128025

Change-Id: I240cc3ff658c26ff6d9f44fada7313885dff98bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398686
Commit-Queue: Viktor Semeniuk <vsemeniuk@google.com>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806732}