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This aligns Chrome's DM token storage with Google Update's.

This CL also makes base::win::RegKey a movable type.

BUG=970162

Change-Id: Id6270411d2417501746ad85f8061cd7d93841618
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1997184
Commit-Queue: Greg Thompson <grt@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731691}