Add a footer to the "Save password?" infobar.

It appears for the Chrome Sync users.

Bug: 890336
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I0a443b3d29670c00c28a847d6d2253db3a620996
Reviewed-on: https://chromium-review.googlesource.com/c/1270922
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#598780}
10 files changed