Fix cursor style for the resize handle of the editor.

Merges [28186] for the 3.9 branch.

props avryl.
fixes #27595.

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Don't allow disabled input styling to get lost in the cascade.

Merges [28179] to the 3.9 branch.

props ocean90.
fixes #27906.

Built from https://develop.svn.wordpress.org/branches/3.9@28202


git-svn-id: http://core.svn.wordpress.org/branches/3.9@28032 1a063a9b-81f0-0310-95a4-ce76da25c4cd