undo CL 4675045 / 0e11e08951f7
undo CL 4675045 / 0e11e08951f7

Breaks Mercurial 1.8.3.

««« original CL description
codereview: fix for Mercurial 1.9

Fixes issue 2038.

R=rsc, bobbypowers
CC=golang-dev
http://codereview.appspot.com/4675045
»»»

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/4685055

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