shiny/example/gallery: build fix.

This should have been updated in f677a3c4 but was missed.

Change-Id: I6e5561af7ededd6c69d0f880c8c53432b3dbae83
Reviewed-on: https://go-review.googlesource.com/25160
Reviewed-by: Nigel Tao <nigeltao@golang.org>
1 file changed