Cleanup after [29179]:

* Remove `wp.media.mixin.pauseAllPlayers()` - was only ever intended to be used in MCE views, reaches too far into global scope. Rendered irrelevant since [28364].
* Remove `wp.media.mixin.pausePlayers()` - added in [28364]. MCE views no longer keep track of player instances and call mixin methods, they refer to their child iframes and call MEjs methods on the iframe's `window.mejs.players`. 

See #28905.

Built from https://develop.svn.wordpress.org/trunk@29194


git-svn-id: http://core.svn.wordpress.org/trunk@28978 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/media-audiovideo.js

@@ -14,17 +14,6 @@
 	 */
 	wp.media.mixin = {
 		mejsSettings: baseSettings,
-		/**
-		 * Pauses every instance of MediaElementPlayer
-		 */
-		pauseAllPlayers: function() {
-			var p;
-			if ( window.mejs && window.mejs.players ) {
-				for ( p in window.mejs.players ) {
-					window.mejs.players[p].pause();
-				}
-			}
-		},
 
 		removeAllPlayers: function() {
 			var p;
@@ -37,15 +26,6 @@
 			}
 		},
 
-		/**
-		 * Pauses the current object's instances of MediaElementPlayer
-		 */
-		pausePlayers: function() {
-			_.each( this.players, function (player) {
-				player.pause();
-			} );
-		},
-
 		/**
 		 * Override the MediaElement method for removing a player.
 		 *	MediaElement tries to pull the audio/video tag out of