LibWeb: Return CSSStyleProperties as a GC::Ref

Author: https://github.com/AtkinsSJ
Commit: 2d220a8bbc
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3983

Libraries/LibWeb/CSS/CSSStyleRule.cpp

@@ -43,7 +43,7 @@ void CSSStyleRule::visit_edges(Cell::Visitor& visitor)
 }
 
 // https://drafts.csswg.org/cssom-1/#dom-cssstylerule-style
-CSSStyleProperties* CSSStyleRule::style()
+GC::Ref<CSSStyleProperties> CSSStyleRule::style()
 {
     return m_declaration;
 }

Libraries/LibWeb/CSS/CSSStyleRule.h

@@ -30,7 +30,7 @@ public:
     String selector_text() const;
     void set_selector_text(StringView);
 
-    CSSStyleProperties* style();
+    GC::Ref<CSSStyleProperties> style();
 
     [[nodiscard]] FlyString const& qualified_layer_name() const { return parent_layer_internal_qualified_name(); }