Access class directly instead of using this in the shortcodeAttrs method of any factory-generated wp.media.collection.

Fixes #27183.



git-svn-id: https://develop.svn.wordpress.org/trunk@27238 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/js/media-editor.js

@@ -406,7 +406,7 @@
 			}
 
  			// Remove default attributes from the shortcode.
- 			_.each( this.defaults, function( value, key ) {
+ 			_.each( wp.media[prop].defaults, function( value, key ) {
  				if ( value === attrs[ key ] ) {
  					delete attrs[ key ];
 				}