servo: Merge #9378 - Invalidate node style after style property removed (from paulrouget:removeProperty); r=KiChjang

Fix #9377

Source-Repo: https://github.com/servo/servo
Source-Revision: 8c0736211bf3e597b4d56a6efe6479a8c2d97c14

servo/components/script/dom/cssstyledeclaration.rs

@@ -329,6 +329,10 @@ impl CSSStyleDeclarationMethods for CSSStyleDeclaration {
             None => elem.remove_inline_style_property(&property),
         }
 
+        let document = document_from_node(elem);
+        let node = elem.upcast();
+        document.content_changed(node, NodeDamage::NodeStyleDamaged);
+
         // Step 6
         Ok(value)
     }