Declare dashicons dependency for wp-pointer.css and media-views.css.

props dd32.
see #26255.

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Twenty Fourteen: pinking shears.
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Twenty Fourteen: ensure attachment image size is correct at 810 pixels. Props iamtakashi, fixes #26384.
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Twenty Fourteen: remove `wp_is_mobile()` call from post thumbnail size logic as it's not intended for front-end use. Props kwight, fixes #26221.
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