Revert "Use gn instead of GYP in SimpleChrome stage"

This reverts commit f67895d75bae253dda0f2c08beabdb3bcdc03252.

There is a bug finding gn on official builders: crbug.com/588794

Change-Id: Ibabc44d84dc6c72992abab4a260de642bb0a3d43
Reviewed-on: https://chromium-review.googlesource.com/354133
Tested-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
1 file changed