wake lock: Slightly adjust the message set with an AbortError exception

Switch from "Wake Lock is being released" to "Wake Lock released" to make it
less confusing. The former can sound like the lock is still being released
by the time the message can be inspected, while the latter indicates this is
an operation that has been completed and cannot be reversed.

Bug: 257511
Change-Id: I8b0d3b749d404031d2e23da4050988c733be6689
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643471
Auto-Submit: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Cr-Commit-Position: refs/heads/master@{#666031}