Add Safety Tips component installer

This component retrieves a binary proto and passes it over to a global
config class. The proto contains a list of URLs that will trigger the
new safety tips UI.

Bug: 984070
Change-Id: I0f3ee423792469a735148d9008e98341074c7d5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1709657
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Joe DeBlasio <jdeblasio@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680757}