Remove unused code from WP_Widget::update_callback().

props OriginalEXE.
fixes #24733.
Built from https://develop.svn.wordpress.org/trunk@27224


git-svn-id: http://core.svn.wordpress.org/trunk@27081 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Allow any vimeo.com subdomain for embeds.

props danielbachhuber.
fixes #24170.

Built from https://develop.svn.wordpress.org/trunk@27225


git-svn-id: http://core.svn.wordpress.org/trunk@27082 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Embolden some instructions when installing a network.

props Ipstenu.
fixes #27057.

Built from https://develop.svn.wordpress.org/trunk@27226


git-svn-id: http://core.svn.wordpress.org/trunk@27083 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unused variable.

props ericlewis.
fixes #27176.

Built from https://develop.svn.wordpress.org/trunk@27227


git-svn-id: http://core.svn.wordpress.org/trunk@27084 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make sure color schemes are registered when WP_Styles is initialized early.

fixes #27175. see #26669.

Built from https://develop.svn.wordpress.org/trunk@27228


git-svn-id: http://core.svn.wordpress.org/trunk@27085 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make nav menu item add tabs and content consistent with similar tabs on the post edit screen. props corvannoorloos for the initial patch. fixes #26757.

Built from https://develop.svn.wordpress.org/trunk@27229


git-svn-id: http://core.svn.wordpress.org/trunk@27086 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unnecessary assignment and concatenation from the_date() and get_the_date().

props juliobox.
fixes #27181.
Built from https://develop.svn.wordpress.org/trunk@27230


git-svn-id: http://core.svn.wordpress.org/trunk@27087 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct @return value for get_the_date().

props TobiasBg.
fixes #27181.
Built from https://develop.svn.wordpress.org/trunk@27231


git-svn-id: http://core.svn.wordpress.org/trunk@27088 1a063a9b-81f0-0310-95a4-ce76da25c4cd