LibWeb: Make factory method of XHR::ProgressEvent fallible

Userland/Libraries/LibWeb/XHR/ProgressEvent.cpp

@@ -9,12 +9,12 @@
 
 namespace Web::XHR {
 
-ProgressEvent* ProgressEvent::create(JS::Realm& realm, DeprecatedFlyString const& event_name, ProgressEventInit const& event_init)
+WebIDL::ExceptionOr<JS::NonnullGCPtr<ProgressEvent>> ProgressEvent::create(JS::Realm& realm, DeprecatedFlyString const& event_name, ProgressEventInit const& event_init)
 {
-    return realm.heap().allocate<ProgressEvent>(realm, realm, event_name, event_init).release_allocated_value_but_fixme_should_propagate_errors();
+    return MUST_OR_THROW_OOM(realm.heap().allocate<ProgressEvent>(realm, realm, event_name, event_init));
 }
 
-ProgressEvent* ProgressEvent::construct_impl(JS::Realm& realm, DeprecatedFlyString const& event_name, ProgressEventInit const& event_init)
+WebIDL::ExceptionOr<JS::NonnullGCPtr<ProgressEvent>> ProgressEvent::construct_impl(JS::Realm& realm, DeprecatedFlyString const& event_name, ProgressEventInit const& event_init)
 {
     return create(realm, event_name, event_init);
 }

Userland/Libraries/LibWeb/XHR/ProgressEvent.h

@@ -23,8 +23,8 @@ class ProgressEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(ProgressEvent, DOM::Event);
 
 public:
-    static ProgressEvent* create(JS::Realm&, DeprecatedFlyString const& event_name, ProgressEventInit const& event_init);
-    static ProgressEvent* construct_impl(JS::Realm&, DeprecatedFlyString const& event_name, ProgressEventInit const& event_init);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<ProgressEvent>> create(JS::Realm&, DeprecatedFlyString const& event_name, ProgressEventInit const& event_init);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<ProgressEvent>> construct_impl(JS::Realm&, DeprecatedFlyString const& event_name, ProgressEventInit const& event_init);
 
     virtual ~ProgressEvent() override;
 

Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp

@@ -83,7 +83,7 @@ void XMLHttpRequest::fire_progress_event(DeprecatedString const& event_name, u64
     event_init.length_computable = true;
     event_init.loaded = transmitted;
     event_init.total = length;
-    dispatch_event(*ProgressEvent::create(realm(), event_name, event_init));
+    dispatch_event(*ProgressEvent::create(realm(), event_name, event_init).release_value_but_fixme_should_propagate_errors());
 }
 
 // https://xhr.spec.whatwg.org/#dom-xmlhttprequest-responsetext