LibWeb: Make TextMetrics GC-allocated

Author: https://github.com/awesomekling
Commit: 6b7a1d13e9
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

@@ -470,7 +470,6 @@ class StorageWrapper;
 class SubtleCryptoWrapper;
 class TextDecoderWrapper;
 class TextEncoderWrapper;
-class TextMetricsWrapper;
 class URLSearchParamsIteratorWrapper;
 class URLSearchParamsWrapper;
 class URLWrapper;