Revert [23407], thereby restoring gradients and shadows. see #23415.


git-svn-id: http://core.svn.wordpress.org/trunk@23500 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revert [23369] and [23370]: the icons. see #23333.


git-svn-id: http://core.svn.wordpress.org/trunk@23501 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid an undefined offset notice in wp_convert_bytes_to_hr(). props soulseekah. fixes #23626.

git-svn-id: http://core.svn.wordpress.org/trunk@23502 1a063a9b-81f0-0310-95a4-ce76da25c4cd