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Per Android UI guidance, radio buttons should not be used in settings
list. To follow the guidance, the "Security" section is renamed to
"Safe Browsing" section. The "DNS over HTTPS" preference remains in the
"Privacy and security" section. For more details, see: go/ep-clank.

To avoid mixing refactoring with functional changes, further renaming
will be done in a followup CL.

* Changes on the "Privacy and security" section
before: http://screen/SoETXTjFKe2
after: http://screen/vH6PVX423xN

* Changes on the "Safe Browsing" section(previous "Security" section)
before: http://screen/02ZdA6rFHK9
after: http://screen/gusmNtHYgnH

Bug: 1097310
Change-Id: Id6de4a38fafad64e4daa39e42f4aa44a28e5ac50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337390Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Commit-Queue: Xinghui Lu <xinghuilu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795580}