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Testing Examples for js/wasm is supported as of ac56baa0, so we can
reenable them.

This reverts CL 119377 (commit 9a917130).

Fixes #25933

Change-Id: I0f228a3ec385dbe9573d3c33e42dccd4488d7152
Reviewed-on: https://go-review.googlesource.com/c/go/+/167800

Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>