LibWeb: Port call_user_object_operation from DeprecatedString

Userland/Libraries/LibWeb/DOM/EventDispatcher.cpp

@@ -113,7 +113,7 @@ bool EventDispatcher::inner_invoke(Event& event, Vector<JS::Handle<DOM::DOMEvent
         // FIXME: These should be wrapped for us in call_user_object_operation, but it currently doesn't do that.
         auto* this_value = event.current_target().ptr();
         auto* wrapped_event = &event;
-        auto result = WebIDL::call_user_object_operation(callback, "handleEvent", this_value, wrapped_event);
+        auto result = WebIDL::call_user_object_operation(callback, "handleEvent"_string, this_value, wrapped_event);
 
         // If this throws an exception, then:
         if (result.is_error()) {

Userland/Libraries/LibWeb/DOM/NodeIterator.cpp

@@ -159,7 +159,7 @@ JS::ThrowCompletionOr<NodeFilter::Result> NodeIterator::filter(Node& node)
 
     // 6. Let result be the return value of call a user object’s operation with traverser’s filter, "acceptNode", and « node ».
     //    If this throws an exception, then unset traverser’s active flag and rethrow the exception.
-    auto result = WebIDL::call_user_object_operation(m_filter->callback(), "acceptNode", {}, &node);
+    auto result = WebIDL::call_user_object_operation(m_filter->callback(), "acceptNode"_string, {}, &node);
     if (result.is_abrupt()) {
         m_active = false;
         return result;

Userland/Libraries/LibWeb/DOM/TreeWalker.cpp

@@ -257,7 +257,7 @@ JS::ThrowCompletionOr<NodeFilter::Result> TreeWalker::filter(Node& node)
 
     // 6. Let result be the return value of call a user object’s operation with traverser’s filter, "acceptNode", and « node ».
     //    If this throws an exception, then unset traverser’s active flag and rethrow the exception.
-    auto result = WebIDL::call_user_object_operation(m_filter->callback(), "acceptNode", {}, &node);
+    auto result = WebIDL::call_user_object_operation(m_filter->callback(), "acceptNode"_string, {}, &node);
     if (result.is_abrupt()) {
         m_active = false;
         return result;

Userland/Libraries/LibWeb/WebIDL/AbstractOperations.cpp

@@ -114,7 +114,7 @@ inline JS::Completion clean_up_on_return(HTML::EnvironmentSettingsObject& stored
     return JS::Value { rejected_promise->promise() };
 }
 
-JS::Completion call_user_object_operation(WebIDL::CallbackType& callback, DeprecatedString const& operation_name, Optional<JS::Value> this_argument, JS::MarkedVector<JS::Value> args)
+JS::Completion call_user_object_operation(WebIDL::CallbackType& callback, String const& operation_name, Optional<JS::Value> this_argument, JS::MarkedVector<JS::Value> args)
 {
     // 1. Let completion be an uninitialized variable.
     JS::Completion completion;
@@ -147,7 +147,7 @@ JS::Completion call_user_object_operation(WebIDL::CallbackType& callback, Deprec
     // 10. If ! IsCallable(O) is false, then:
     if (!object->is_function()) {
         // 1. Let getResult be Get(O, opName).
-        auto get_result = object->get(operation_name);
+        auto get_result = object->get(operation_name.to_deprecated_string());
 
         // 2. If getResult is an abrupt completion, set completion to getResult and jump to the step labeled return.
         if (get_result.is_throw_completion()) {

Userland/Libraries/LibWeb/WebIDL/AbstractOperations.h

@@ -19,11 +19,11 @@ namespace Web::WebIDL {
 
 ErrorOr<ByteBuffer> get_buffer_source_copy(JS::Object const& buffer_source);
 
-JS::Completion call_user_object_operation(WebIDL::CallbackType& callback, DeprecatedString const& operation_name, Optional<JS::Value> this_argument, JS::MarkedVector<JS::Value> args);
+JS::Completion call_user_object_operation(WebIDL::CallbackType& callback, String const& operation_name, Optional<JS::Value> this_argument, JS::MarkedVector<JS::Value> args);
 
 // https://webidl.spec.whatwg.org/#call-a-user-objects-operation
 template<typename... Args>
-JS::Completion call_user_object_operation(WebIDL::CallbackType& callback, DeprecatedString const& operation_name, Optional<JS::Value> this_argument, Args&&... args)
+JS::Completion call_user_object_operation(WebIDL::CallbackType& callback, String const& operation_name, Optional<JS::Value> this_argument, Args&&... args)
 {
     auto& function_object = callback.callback;