Customizer: Don't hide controls the preview frame has no information about.

props kovshenin.
see #27993.
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Make sure phpinfo() is not disabled before calling it in apache_mod_loaded().

props rohan013, harmr.
fixes #26772.
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git-svn-id: http://core.svn.wordpress.org/trunk@29110 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Prevent key event handlers from firing when in input areas in the media modal, as people understandably want to type inside said inputs. props kovshenin. fixes #28704.

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git-svn-id: http://core.svn.wordpress.org/trunk@29111 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use node.nodeName instead of tagName for better consistency/compatibility, see #28704.
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