Move components/enterprise/ to use new base::Pickle functionality

This moves to using the new base::Pickle creation factories,
opting for a safer internalized memory.

Bug: 330028190
Change-Id: I7b26c78eb9b849f0a881c0486e73fba082fc005c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5386006


Commit-Queue: Sébastien Lalancette <seblalancette@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Reviewed-by: Sébastien Lalancette <seblalancette@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1276829}