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This is necessary because Polymer 3 infra does not support flattenhtml.

R=khorimoto@chromium.org

Bug: none
Test: OS Settings -> Networks -> Add Network -> See add wifi icon
Change-Id: I8957b3d60aad33e13a785d2fef15922c10218abb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446522Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: James Hawkins <jhawkins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813427}