servo: Merge #2785 - Make pseudo :before and :after elements inherit style from attached (from glennw:content-font-size)

Source-Repo: https://github.com/servo/servo
Source-Revision: a9e54575886f22383c8da40a4885db87abb7bbdb

servo/src/components/layout/css/matching.rs

@@ -553,14 +553,14 @@ impl<'ln> MatchMethods for LayoutNode<'ln> {
                                                  applicable_declarations_cache,
                                                  applicable_declarations.normal_shareable);
                 if applicable_declarations.before.len() > 0 {
-                    self.cascade_node_pseudo_element(parent_style,
+                    self.cascade_node_pseudo_element(Some(layout_data.shared_data.style.get_ref()),
                                                      applicable_declarations.before.as_slice(),
                                                      &mut layout_data.data.before_style,
                                                      applicable_declarations_cache,
                                                      false);
                 }
                 if applicable_declarations.after.len() > 0 {
-                    self.cascade_node_pseudo_element(parent_style,
+                    self.cascade_node_pseudo_element(Some(layout_data.shared_data.style.get_ref()),
                                                      applicable_declarations.after.as_slice(),
                                                      &mut layout_data.data.after_style,
                                                      applicable_declarations_cache,