Make SpeechRecognition class final

rdar://124437578
https://bugs.webkit.org/show_bug.cgi?id=270842

Reviewed by Eric Carlson.

* Source/WebCore/Modules/speech/SpeechRecognition.h:

Canonical link: https://commits.webkit.org/275974@main

Source/WebCore/Modules/speech/SpeechRecognition.h

@@ -36,7 +36,7 @@ namespace WebCore {
 class Document;
 class SpeechRecognitionResult;
 
-class SpeechRecognition : public SpeechRecognitionConnectionClient, public ActiveDOMObject, public RefCounted<SpeechRecognition>, public EventTarget  {
+class SpeechRecognition final : public SpeechRecognitionConnectionClient, public ActiveDOMObject, public RefCounted<SpeechRecognition>, public EventTarget  {
     WTF_MAKE_ISO_ALLOCATED(SpeechRecognition);
 public:
     static Ref<SpeechRecognition> create(Document&);