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PpdProvider v3: refactor PpdMetadataPathSpecifier

This change follows up on feedback in
https://crrev.com/c/2340571
and refactors the way in which the PpdMetadataManager builds PPD
metadata paths into the Chrome OS Printing serving root.

Bug: chromium:888189
Test: chromeos_unittests --gtest_filter='PpdMetadataManagerTest.*'
Change-Id: Ie2619526b596656a3186a708272c9e6da8ad3bf2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377069
Commit-Queue: Kalvin Lee <kdlee@chromium.org>
Reviewed-by: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808098}