Remove screenshotGallery. see #25948.

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Twenty Fourteen: Remove unused and untoggled no-js class.

props johnbillion.
fixes #26453.

Built from https://develop.svn.wordpress.org/trunk@26729


git-svn-id: http://core.svn.wordpress.org/trunk@26618 1a063a9b-81f0-0310-95a4-ce76da25c4cd