[wp-meta] [Making WordPress.org] #2872: Remove "wp_custom_css_cb" compat fix

[Making WordPress.org]

#2872: Remove "wp_custom_css_cb" compat fix
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 Reporter:  Kau-Boy                  |      Owner:
     Type:  enhancement              |     Status:  new
 Priority:  normal                   |  Milestone:
Component:  WordCamp Site & Plugins  |   Keywords:  has-patch
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 As r39616 is merged, we should be OK to remove those lines.

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Ticket URL: <https://meta.trac.wordpress.org/ticket/2872>
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