[ios] Enhances TableViewTextButton to work with the Passwords Infobar Modal

Makes changes to TableViewTextButton so it can be used with the Password
Infobar Modal.
Adds these buttons to InfobarPasswordTableViewController and hooks them
to their actions.

Screenshot:
https://drive.google.com/open?id=1CAJc2tT_oyL9Xyrm6b6krtZo1fxcey7T

Bug: 945478
Change-Id: Iadfdec6081a5742ec786102e040cf7a38396c17b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1572962
Reviewed-by: Peter Lee <pkl@chromium.org>
Reviewed-by: Chris Lu <thegreenfrog@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652540}
9 files changed