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This change updates the parsing code for Printers metadata to
accommodate the new version we are pushing from our serving root.

Bug: chromium:888189,b:161547656
Test: chromeos_unittests --gtest_filter='PpdMetadataParserTest.*'
Test: chromeos_unittests --gtest_filter='PpdMetadataManagerTest.*'
Change-Id: I54d3cbffdbbc3e51f4e636d0a904179a05c9132f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315158Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Kalvin Lee <kdlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792959}