This removes support for opacity, filters and clip-path
on RenderInlines. If you want inline content that uses
these properties you need to use an inline-block. We
may want to add back support for opacity or filters
on inlines eventually, but we'd implement it differently
and right now they're getting in the way.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/950963003