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Named namespaces are discouraged in chrome/ (as discussed on
chromium-dev and recently codified in
https://chromium.googlesource.com/chromium/src/+/master/styleguide/c++/c++-dos-and-donts.md#named-namespaces). This
removes the safety_tips namespace, renames a couple functions as
needed, and does a little more miscellaneous cleanup (e.g., removing
unnecessary aliases).

TBR=csharrison@chromium.org,ellyjones@chromium.org

Change-Id: I28dbd6ba2a90784fe148e91ccd75bc607d6192b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876474Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Joe DeBlasio <jdeblasio@chromium.org>
Commit-Queue: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709073}