test: remove unused code in run.go
test: remove unused code in run.go

Change-Id: Ie2a77a9643697cfda4376db606711c09da220405
GitHub-Last-Rev: ff1cf0b9d831d626f7a8e0e80340d908ce5c32cf
GitHub-Pull-Request: golang/go#53902
Reviewed-on: https://go-review.googlesource.com/c/go/+/417734
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Auto-Submit: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@google.com>

golang/go,golang/go,golang/go,golang/go,golang/go,golang/go,golang/go,golang/go