This reverts commit aa8c8e77.

Reason: Decision to back out current alias implementation.

For #16339.

Change-Id: I4db9a8d6b3625c794be9d2f1ff0e9c047f383d28
Reviewed-on: https://go-review.googlesource.com/32827
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Chris Manghane <cmang@golang.org>