In `wp_localize_script()`, instantiate the `$wp_scripts` global instead of bailing when it is called before `wp_enqueue_scripts`. This allows `wp_enqueue_media()` to be called on the front end with no JS errors. 

Props ericlewis.
Fixes #24724.

Built from https://develop.svn.wordpress.org/trunk@28840


git-svn-id: http://core.svn.wordpress.org/trunk@28644 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add mime support for 3gp, 3g2 and 3gpp video formats. These are not supported by MediaElement or the WP media shortcodes, just an FYI.

Props azaozz, m_uysl.
Fixes #23380.

Built from https://develop.svn.wordpress.org/trunk@28841


git-svn-id: http://core.svn.wordpress.org/trunk@28645 1a063a9b-81f0-0310-95a4-ce76da25c4cd