GitLab

Make user policy pushed CAs test only depend on user policy

The goal is to make it obvious that the browser test testing
policy-provided CA certificates which are used as trust anchors
does not depend on device policy.
Use InProcessBrowserTest instead of DevicePolicyCrosBrowserTest as base
class for the test to achieve this.
To make this easier, move the common 'user policy provided CA cert' test
functionality to its own class, used by multiple tests.

Bug: 874937
Test: browser tests
Change-Id: I2be87daeafa7e21dd08de97958c2b66a8cb43271
Reviewed-on: https://chromium-review.googlesource.com/c/1178047Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608299}