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- Polymer3 does not require html files in its build resources.
- Streamlined adding new resource files for print management.

Bug: 1053704
Change-Id: If9c993aec0380315058296cfc83f90623e5b5871
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2259137
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784230}