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The CL is a next stage of removing "Smart Lock" branch from the password UI.
We do the following:
- Change the behavior of IsSmartLockUser().
Those syncing with the custom passphrase should see the same UI as normal sync users.
- Use "passwords.google.com" site from the string resource instead of the constant.
Thus, it's possible to change it via Finch.
- Add a footer to the save/update password bubble.
For signed-in users it clarifies that the credentials are stored in the Google Account.

TBR=hcarmona@chromium.org

Bug: 865437,862269
Change-Id: I3a58e26319191b0e24fbc1ac793d6028b1828e1e
Reviewed-on: https://chromium-review.googlesource.com/1146648
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Ioana Pandele <ioanap@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577819}