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A default DNS prefetch entry for s.w.org was previously included to save a few ms in case an emoji is used that is not supported by the browser. It appears this use case doesn't justify a prefetch to s.w.org on every WordPress website. This changesets removes `emoji_svg_url` prefetch from `wp_resource_hints()`. It also updates unit tests in `Tests_General_wpResourceHints` by removing `test_should_have_defaults_on_frontend()` entirely and removing s.w.org prefetch from expected output of ten other test functions. Plugin authors can use the `wp_resource_hints` filter if they need to re-add the DNS prefetch entry for s.w.org. Follow-up to [37920], [38122]. Props joelhardi, superpoincare, jhabdas, garrett-eclipse, sabernhardt, SergeyBiryukov. Fixes #40426. See #37387. git-svn-id: https://develop.svn.wordpress.org/trunk@53904 602fd350-edb4-49c9-b593-d223f7449a82