Use the Windows MDM API to check if the machine is being managed.

BUG=690163

Review-Url: https://codereview.chromium.org/2581353002
Cr-Original-Commit-Position: refs/heads/master@{#452028}
Committed: https://chromium.googlesource.com/chromium/src/+/ee0c03ddb4a10c8c9d14244bdefc8034054e846e
Review-Url: https://codereview.chromium.org/2581353002
Cr-Commit-Position: refs/heads/master@{#452484}
19 files changed