LibWeb: Make CSS::Screen GC-allocated

Author: https://github.com/awesomekling
Commit: 8c90e08e0b
Pull-request: https://github.com/SerenityOS/serenity/pull/14816
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/Forward.h

@@ -477,7 +477,6 @@ class Path2DWrapper;
 class PerformanceTimingWrapper;
 class RangePrototype;
 class ResizeObserverWrapper;
-class ScreenWrapper;
 class SelectionWrapper;
 class StorageWrapper;
 class SubtleCryptoWrapper;