Do not use notifyAsUser or cancelAsUser

(This is a reupload of aosp/1097315 which caused issues downstream in
merge)

Instead we can create context as user and call the public notify/cancel
methods.

Bug: 137202333
Test: manual
Change-Id: I8caf837db6f23496c90ade4782408c5af70f9759
Merged-In: I8caf837db6f23496c90ade4782408c5af70f9759
1 file changed