Fix JSHint errors in theme-install.js.

props kovshenin.
fixes #26045.

Built from https://develop.svn.wordpress.org/trunk@26210


git-svn-id: http://core.svn.wordpress.org/trunk@26118 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: use HTML entity for arrow in Help text string, props dd32. See #25837.
Built from https://develop.svn.wordpress.org/trunk@26211


git-svn-id: http://core.svn.wordpress.org/trunk@26119 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in quicktags.js. Ignore deprecated API rather than marking it as exported globals.

props kovshenin.
fixes #26046.

Built from https://develop.svn.wordpress.org/trunk@26212


git-svn-id: http://core.svn.wordpress.org/trunk@26120 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in wp-plupload.js.

props atimmer.
fixes #26044.

Built from https://develop.svn.wordpress.org/trunk@26213


git-svn-id: http://core.svn.wordpress.org/trunk@26121 1a063a9b-81f0-0310-95a4-ce76da25c4cd