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This CL is in preparation for enabling Polymer3 in ChromeOS settings
pages. It fixed issues in os_printing_page/ folder that break
semi-automatic Polymer3 migration. These changes include splitting up
files that contain multiple <dom-module> elements, as this is required
by Polymer3 conversion tools.

Bug: 1045266
Change-Id: Idf9b18aac87b74d34a431ffe5383fd2f845554fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151090Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: jimmy gong <jimmyxgong@chromium.org>
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Cr-Commit-Position: refs/heads/master@{#762024}