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This is in preparation of migrating to Polymer3.

Bug: 1022215
Change-Id: Iee652ed3477175346f99c7a490d1637e754644ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1907413Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714640}