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Also, start using assert() in NTP code. This is helpful for compile time
typechecking and runtime enforcement.

Based on https://crrev.com/c/1763345 by Evan Stade <estade@chromium.org>

R=gayane@chromium.org
BUG=996209

Change-Id: I6ab3f92e93ae52249bafd722733aa4bb63289930
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764794
Commit-Queue: Dan Beam <dbeam@chromium.org>
Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690161}