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This is in preparation of migratincg WebUI pages that depend on
it (History, Downloads, Settings) to Polymer3.

Bug: 1022215
Change-Id: I536beb13fa639ad6ecf20d2b414c5bd23f5032f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912799Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714724}