GitLab

This change
(1) adds dns_over_https to the tests' fake prefs.
(2) makes TestPrivacyPageBrowserProxy usable in its default state.
(3) adds a check for undefined prefs to secure_dns.js, to match the
other privacy preference UI elements.

Bug: 1087444
Change-Id: Ic8fb7e200d515d7a1da541c62ca3e90640e56060
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2223639Reviewed-by: Eric Orth <ericorth@chromium.org>
Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: Ben Schwartz <bemasc@chromium.org>
Auto-Submit: Ben Schwartz <bemasc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774369}