Revisions: Disable URL updating if a browser doesn't support the History API. Like IE < 10.

props markjaquith. see #24736.

git-svn-id: https://core.svn.wordpress.org/trunk@24689 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta4-24690.

git-svn-id: https://core.svn.wordpress.org/trunk@24690 1a063a9b-81f0-0310-95a4-ce76da25c4cd