Disable DNS Prefetch for WordPress Emoji (WP 4.6)

[chrisatomix]

In WP 4.6 the new DNS Prefetch feature was added. On a typical site it looks like this:

<link rel='dns-prefetch' href='//ajax.googleapis.com'>
<link rel='dns-prefetch' href='//maxcdn.bootstrapcdn.com'>
<link rel='dns-prefetch' href='//s.w.org'>

I was trying to determine where the s.w.org hostname was coming from, and tracked it down to here:
https://core.trac.wordpress.org/attachment/ticket/37387/37387.diff

# src/wp-includes/general-template.php
// Add DNS prefetch for the Emoji CDN. 
// The path is removed in the foreach loop below. 
/** This filter is documented in wp-includes/formatting.php */ 
$hints['dns-prefetch'][] = apply_filters( 'emoji_svg_url', 'https://s.w.org/images/core/emoji/2/svg/' ); 

I've added a single line to the Soil cleanup module to disable this unnecessary DNS prefetch, and I can confirm it worked on my test site. Changing the URL to false seems to be the only way to prevent disable it.
As far as I can tell nothing else in the HEAD has changed in WP 4.6.

[QWp6t]

Style check failed because you don't have a space after the comma. If you wanna add that, I'll go ahead and merge this. I'd prefer if you can squash your commits as well, but if you can't/won't, then I can squash when I merge.

[chrisatomix]

@QWp6t Oops, sorry about that (got distracted by a team meeting and pushed too early). Should be good now.

[QWp6t]

Thanks!