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Refactor PrintSettingsFromJobSettings to return a unique pointer.
Also add unit tests for the print settings conversion functions.

Test: ./printing_unittests
Change-Id: I4afd3e7ff466948cea9a372293dbff93ca2a12bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337953
Auto-Submit: Pranav Batra <batrapranav@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804008}