Layout: Don't generate :before and :after boxes for replaced elements.

In CSS 2.1 this was undefined.

  CSS 2.1 -- 12.1 The :before and :after pseudo-elements

    Note. This specification does not fully define the interaction
    of :before and :after with replaced elements (such as IMG in HTML).
    This will be defined in more detail in a future specification.

    -- https://www.w3.org/TR/CSS21/generate.html#before-after-content

In CSS 3 the :before and :after generated content boxes are not allowed
on replaced elements.

  CSS 3 Generated and Replaced Content Module
        12. Replaced content

  The box model defines different rules for the layout of replaced
  elements than normal elements. Replaced elements do not have
  '::before' and '::after' pseudo-elements; the 'content' property
  in the case of replaced content replaces the entire contents of
  the element's box.

  -- https://www.w3.org/TR/css3-content/#replacedContent

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