Post locks and autosave:
- Move nonces refreshing from autosave to lock checking.
- Do autosave only when there is something to save.
See #23295

git-svn-id: https://core.svn.wordpress.org/trunk@24209 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta2-24210.

git-svn-id: https://core.svn.wordpress.org/trunk@24210 1a063a9b-81f0-0310-95a4-ce76da25c4cd