Revert [28613] and [28664]. A good idea, but too much BC baggage.

See #28099.


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Further adjustments after [8364], listen to an editor instance event instead of delegating a body click when attempting to pause all players belonging to a particular MCE view.

Props avryl.
Fixes #27971.

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git-svn-id: http://core.svn.wordpress.org/trunk@28597 1a063a9b-81f0-0310-95a4-ce76da25c4cd