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This CL does the following.
1) Renames KeyPermissions to KeyPermissionsManager and
2) Creates KeyPermissionsManagerUserService which is a
keyed-service.

Bug: 1117010
Change-Id: I9cfaa94a29cf934cc2b9d9a91e3633908c37ffce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362729
Commit-Queue: Omar Morsi <omorsi@google.com>
Reviewed-by: Edman Anjos <edman@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800331}