The 'customize_preview_link' filter has been replaced by 'customize_allowed_urls'.
Improved accuracy when checking for wp-admin.
Improved accuracy when attempting to match the schemes of the control and preview frames.
Improved accuracy of internal link whitelist.
git-svn-id: http://core.svn.wordpress.org/trunk@20882 1a063a9b-81f0-0310-95a4-ce76da25c4cd