fmt: remove "Scan:" prefix from error messages The prefix was not uniformly applied and is probably better left off anyway.
fmt: remove "Scan:" prefix from error messages
The prefix was not uniformly applied and is probably better left off anyway.

Fixes issue 4944.

R=golang-dev, dsymonds
CC=golang-dev
https://codereview.appspot.com/12140043

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang