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As part of Friendly settings, we are changing the encryption UI to be an
expandable button. The menu is expanded by default in case of encryption
with custom passphrase.

Screenshots:
http://screen/TjYzvt1Mm1Z
http://screen/GuBbKarc59a
http://screen/8sWerk9f6zQ

Bug: 1046410
Change-Id: Ie106c4f50a50538f4514178440df0fcd32127f1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2025349
Commit-Queue: Monica Basta <msalama@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738988}