GitLab

Add preprocess=true for some Polymer 3 Web UI/settings files that use
<if expr>.

Bug: 1026426
Change-Id: If89264703c33983570e4733d4ea4a5927effb81f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040530Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738759}