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This CL deals with the additional comments of CL 159017.

Change-Id: I4ad3c60c834646d58dc0c544c741b92bfe83fb8b
Reviewed-on: https://go-review.googlesource.com/c/go/+/168857

Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>