LibWeb: Make TextDecoder GC-allocated

Author: https://github.com/awesomekling
Commit: 018d236439
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

@@ -461,7 +461,6 @@ class OptionConstructor;
 class RangePrototype;
 class ResizeObserverWrapper;
 class SelectionWrapper;
-class TextDecoderWrapper;
 class URLSearchParamsIteratorWrapper;
 class URLSearchParamsWrapper;
 class URLWrapper;