WebUI Polymer 2: Stop including HTML Imports V0 Polyfill on non-CrOS

Bug: 944281
Change-Id: I9691d088830528b476e27808f82dd9060d54590b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1582624
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653895}
1 file changed