*** Reason for rollback ***
roll back the changes to the tutorial programs (only) since they
break the automated processing used to create the tutorial.
*** Original change description ***
apply gofmt to the LGTM-marked files from 34501
that have not changed since I applied gofmt.
R=rsc
DELTA=139 (0 added, 44 deleted, 95 changed)
OCL=35670
CL=35670