Upgrade MediaElement to 2.15.1.

Changes from 2.15.0:
https://github.com/johndyer/mediaelement/compare/2.15.0...2.15.1

Continues to revert upstream commit b7f82b4 to restore the status quo for Chromium support.

See [29688].
Fixes #29620 for trunk.

Built from https://develop.svn.wordpress.org/trunk@29733


git-svn-id: http://core.svn.wordpress.org/trunk@29507 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update getID3 library to 1.9.8.

Changes:
https://github.com/JamesHeinrich/getID3/compare/1.9.7...v1.9.8

Fixes #29627.

Built from https://develop.svn.wordpress.org/trunk@29734


git-svn-id: http://core.svn.wordpress.org/trunk@29508 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Allow arbitrary subdomains for the oEmbed endpoint for Slideshare.

Props Latz.
Fixes #29427.

Built from https://develop.svn.wordpress.org/trunk@29735


git-svn-id: http://core.svn.wordpress.org/trunk@29509 1a063a9b-81f0-0310-95a4-ce76da25c4cd
After [29733], version bump for MediaElement.

Built from https://develop.svn.wordpress.org/trunk@29736


git-svn-id: http://core.svn.wordpress.org/trunk@29510 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `media_handle_upload()`, don't call `wp_read_image_metadata()` on things that aren't images (like videos). We never caught this error, because we are suppressing it by calling `@wp_read_image_metadata()`.

Props jrf for the initial patch.
Fixes #28907.

Built from https://develop.svn.wordpress.org/trunk@29737


git-svn-id: http://core.svn.wordpress.org/trunk@29511 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editor expand: hide TinyMCE float panels and tooltips when scrolling, props avryl, fixes #29516 for trunk.
Built from https://develop.svn.wordpress.org/trunk@29738


git-svn-id: http://core.svn.wordpress.org/trunk@29512 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add some `@since` annotations to `media-views.js`.

Props DrewAPicture.
See #28459.

Built from https://develop.svn.wordpress.org/trunk@29739


git-svn-id: http://core.svn.wordpress.org/trunk@29513 1a063a9b-81f0-0310-95a4-ce76da25c4cd
kses: Add colgroup.

props collinsinternet.
fixes #29433.

Built from https://develop.svn.wordpress.org/trunk@29740


git-svn-id: http://core.svn.wordpress.org/trunk@29514 1a063a9b-81f0-0310-95a4-ce76da25c4cd