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This adds a pref to track the scope of the Connector prefs. This is
in preparation for code that will read this scope to decide which DM
token to use with the corresponding pref.

Bug: 1147464
Change-Id: Ib40c92fb9532b66f73e9f50e36e3074fbe376c04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568435
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834391}