cmd/gopherbot: minor follow-ups from previous CL

This change resolves outstanding comments in golang.org/cl/209717. The
import change was due to my using goimports -local.

Change-Id: I55b50166caf9ac347a11f5d3f5025860f436fc82
Reviewed-on: https://go-review.googlesource.com/c/build/+/210781
Run-TryBot: Alexander Rakoczy <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: Carlos Amedee <[email protected]>

Author: toothrot

cmd/gopherbot/gopherbot.go

@@ -281,7 +281,6 @@ type gopherbot struct {
 	}
 }
 
-// tasks are executed in order every corpus update.
 var tasks = []struct {
 	name string
 	fn   func(*gopherbot, context.Context) error

cmd/gopherbot/gopherbot_test.go

@@ -13,7 +13,6 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/google/go-github/github"
-
 	"golang.org/x/build/devapp/owners"
 	"golang.org/x/build/maintner"
 )