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At smaller window sizes, parts of the settings section become hidden
from view. Allow users to scroll through the settings section when this
occurs.

Screenshot: http://shortn/_kQ7nVMKigV

Bug: 1059779
Change-Id: I1e118760c8dfa6a191163416028681b3644d6869
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596170Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838260}