Make PluginVmImage a user policy

The PluginVmImage policy has been introduced as a device policy, which
turned out to be wrong. Since it has not been used yet, we can change
it to a user policy. Pref mappings will follow with a separate CL.

Bug: 904843
Change-Id: I6f9e7f4288bfafc4cd89a5bef0bdf38a397239b1
Reviewed-on: https://chromium-review.googlesource.com/c/1348094
Commit-Queue: Alex Oldemeier <aoldemeier@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#610873}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7dba38f4491ab67b94d778db990c2f26a854375e
1 file changed