DFW:
- Add background color and remove the top border from the status bar (at the bottom).
- Fix spinner to always be next to the Save button.
- Remove width: auto; from .mce-fixed-width.
Fixes #27709

git-svn-id: https://develop.svn.wordpress.org/trunk@28116 602fd350-edb4-49c9-b593-d223f7449a82