Pass the difference (i.e. 1 or -1) to updatePending() so that the current
pending count is changed for each element independently. Also move several
functions back out of the global scope, see r17832 for their introduction.
git-svn-id: http://svn.automattic.com/wordpress/trunk@19895 1a063a9b-81f0-0310-95a4-ce76da25c4cd