WebUI Dark Mode: fix various .svg url()s with optimize_webui = true

R=aee@chromium.org
BUG=883049

Change-Id: I59f447ca7e21e7b2e8db4f8686e0739e8e68eaf7
Reviewed-on: https://chromium-review.googlesource.com/c/1437579
Reviewed-by: Esmael El-Moslimany <aee@chromium.org>
Commit-Queue: Dan Beam (slow until 1/29) <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626303}
2 files changed