GitLab

Convert and simplify all the type-specific builders to use them. Also
convert integrity tests to just use a generic builder because the
integrity-specific builder only ever took raw bytes anyway.

Change-Id: I1972c9aaf79b749ed82516fccd473547b2c931ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2477535Reviewed-by: Dan McArdle <dmcardle@chromium.org>
Commit-Queue: Eric Orth <ericorth@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818604}