Revert #19666 since we do create NAC elements and expect them to be inline.

This reverts commit 1970e82b0d, reversing
changes made to e882660ea6.

The reparenting logic is still bogus, but I'll figure out how to deal with that
in a bit.

components/style/gecko/wrapper.rs

@@ -1256,6 +1256,19 @@ impl<'le> TElement for GeckoElement<'le> {
         }
     }
 
+    #[inline]
+    fn skip_root_and_item_based_display_fixup(&self) -> bool {
+        if !self.is_native_anonymous() {
+            return false;
+        }
+
+        if let Some(p) = self.implemented_pseudo_element() {
+            return p.skip_item_based_display_fixup();
+        }
+
+        self.is_root_of_native_anonymous_subtree()
+    }
+
     unsafe fn set_selector_flags(&self, flags: ElementSelectorFlags) {
         debug_assert!(!flags.is_empty());
         self.set_flags(selector_flags_to_node_flags(flags));