This reverts commit 53227762.

Reason for revert: broke js-wasm builder.

Change-Id: If22762317c4a9e00f5060eb84377a4a52d601fca
Reviewed-on: https://go-review.googlesource.com/c/go/+/192157
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>