JSHint: Make commentReply a declared global from elsewhere.

props adamsilverstein.
see #25979, [26156].

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git-svn-id: http://core.svn.wordpress.org/trunk@26068 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in custom-header.js and custom-background.js.

props jorbin.
fixes #25915, #25916.

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git-svn-id: http://core.svn.wordpress.org/trunk@26069 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in the old XML-based ajax response JS.

props OriginalEXE.
fixes #25954.

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git-svn-id: http://core.svn.wordpress.org/trunk@26070 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in admin-bar.js.

props kadamwhite.
fixes #25970.

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git-svn-id: http://core.svn.wordpress.org/trunk@26071 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in media-views.js.

props kadamwhite.
fixes #25974.

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git-svn-id: http://core.svn.wordpress.org/trunk@26072 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors (again) for revisions.js.

props adamsilverstein.
fixes #25955.

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git-svn-id: http://core.svn.wordpress.org/trunk@26073 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in nav-menu.js.

props atimmer.
fixes #25953.

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git-svn-id: http://core.svn.wordpress.org/trunk@26074 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Bacground Updates: Move the 'automatic_updates_complete' hook to only fire when some updates have actually been completed. Props nacin. Fixes #25841

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git-svn-id: http://core.svn.wordpress.org/trunk@26075 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove old control/accordion section title gradients that were still appearing in the customizer and reinstate a divider between the customizer sidebar and the preview. props ryelle, helen. see #25858.

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git-svn-id: http://core.svn.wordpress.org/trunk@26076 1a063a9b-81f0-0310-95a4-ce76da25c4cd