MD Settings: remove .settings-card to make spacing more consistent
After lengthy conversations with bettes@, it seems more consistent to
simply remove the extra top/bottom padding that settings-card added.
It looked better in some cases, but generally gave us more headaches
than it alleviated.
R=dschuyler@chromium.org
BUG=
589630
Committed:
https://crrev.com/287837b73f873871b28df447528fc6fbadc06f20
Cr-Commit-Position: refs/heads/master@{#377985}