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This is in preparation for migrating settings-languages to Polymer 3.

Bug: 1026426
Change-Id: I375d9dfa5868a78d20fccc7184601975936047b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076763
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745225}