Fix JSHint errors in wplink.js.

props jorbin.
fixes #25914.

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git-svn-id: http://core.svn.wordpress.org/trunk@26101 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors for customize-loader.

props mdbitz.
fixes #26040.

Built from https://develop.svn.wordpress.org/trunk@26194


git-svn-id: http://core.svn.wordpress.org/trunk@26102 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in six files.

props mdbitz.
fixes ##26011, #26012, #26013, #26014, #26038, #26039.

Built from https://develop.svn.wordpress.org/trunk@26195


git-svn-id: http://core.svn.wordpress.org/trunk@26103 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in media-upload.js.

props iblamefish.
fixes #26023.

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git-svn-id: http://core.svn.wordpress.org/trunk@26104 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in heartbeat.js.

props dziudek.
fixes #25986.

Built from https://develop.svn.wordpress.org/trunk@26197


git-svn-id: http://core.svn.wordpress.org/trunk@26105 1a063a9b-81f0-0310-95a4-ce76da25c4cd