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This is in preparation of migrating to Polymer3.

Bug: 1012533
Change-Id: Iab0d6d25a5c5df4ba5c19deccb98ad3ee968a982
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881842
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710151}