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This is in preparation of migrating to Polymer3. There is no clear benefit of
keeping these scripts separated anymore, and it does get in the way of making
the optimized Polymer3 version from working correctly.

Bug: 1022215
Change-Id: I40e29c2f22b687e8ba9bad076bc6f6a16ce95731
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1914833Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715161}