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This change adds byte (as opposed to std::string) based functions to
save callers some copies and casts.

Change-Id: Ib3306c6abf14c8ff849009e1752284bc693da44a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1776793
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: David Benjamin <davidben@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692159}