Video: 

* Don't set height on responsive `<div>` when generating markup
* Move some CSS rules from the style tag to `.wp-video`
* Use Video Details view event delegation instead of click events delegated from `<body>`
* Fix some CSS rule collision in the grid modal

See #29110.

Built from https://develop.svn.wordpress.org/trunk@29456


git-svn-id: http://core.svn.wordpress.org/trunk@29234 1a063a9b-81f0-0310-95a4-ce76da25c4cd