LibWeb: Make factory method of CSS::ResolvedCSSStyleDeclaration fallible

Author: https://github.com/kennethmyhra
Commit: 8fbd43cb27
Pull-request: https://github.com/SerenityOS/serenity/pull/17491
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.h

@@ -14,7 +14,7 @@ class ResolvedCSSStyleDeclaration final : public CSSStyleDeclaration {
     WEB_PLATFORM_OBJECT(ResolvedCSSStyleDeclaration, CSSStyleDeclaration);
 
 public:
-    static ResolvedCSSStyleDeclaration* create(DOM::Element& element);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<ResolvedCSSStyleDeclaration>> create(DOM::Element& element);
 
     virtual ~ResolvedCSSStyleDeclaration() override = default;