undo CL 13348045 / 43675523c526
undo CL 13348045 / 43675523c526

There is no reason to do this, and it's more work.

««« original CL description
net: make channel-based semaphore depend on receive, not send

R=r, dvyukov
CC=golang-dev
https://codereview.appspot.com/13348045

Committer: Rob Pike <r@golang.org>
»»»

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/13632047

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