LibJS: Convert NativeFunction::create() to NonnullGCPtr

Author: https://github.com/linusg
Commit: b42e293ddd
Pull-request: https://github.com/SerenityOS/serenity/pull/16479
Reviewed-by: https://github.com/davidot ✅

Userland/Libraries/LibJS/Runtime/Completion.cpp

@@ -62,7 +62,7 @@ ThrowCompletionOr<Value> await(VM& vm, Value value)
     };
 
     // 4. Let onFulfilled be CreateBuiltinFunction(fulfilledClosure, 1, "", « »).
-    auto* on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 1, "");
+    auto on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 1, "");
 
     // 5. Let rejectedClosure be a new Abstract Closure with parameters (reason) that captures asyncContext and performs the following steps when called:
     auto rejected_closure = [&success, &result](VM& vm) -> ThrowCompletionOr<Value> {
@@ -86,7 +86,7 @@ ThrowCompletionOr<Value> await(VM& vm, Value value)
     };
 
     // 6. Let onRejected be CreateBuiltinFunction(rejectedClosure, 1, "", « »).
-    auto* on_rejected = NativeFunction::create(realm, move(rejected_closure), 1, "");
+    auto on_rejected = NativeFunction::create(realm, move(rejected_closure), 1, "");
 
     // 7. Perform PerformPromiseThen(promise, onFulfilled, onRejected).
     auto* promise = verify_cast<Promise>(promise_object);