TinyMCE: fix editor focus issues after ontouchstart event on the parent document in iOS Safari. Fixes #25131 for 3.7.
Built from https://develop.svn.wordpress.org/trunk@25132


git-svn-id: https://core.svn.wordpress.org/trunk@25112 1a063a9b-81f0-0310-95a4-ce76da25c4cd