Fix virtual/override/final usage in Source/modules/.

Source/modules/webmidi/MIDIInput.h

Index: Source/modules/webmidi/MIDIInput.h
diff --git a/Source/modules/webmidi/MIDIInput.h b/Source/modules/webmidi/MIDIInput.h
index 83e38cebbcd7f9a471fc892379d96ecdcd5c09a8..e7c4c21daf0ca94491cd03db89505ac473f854c0 100644
--- a/Source/modules/webmidi/MIDIInput.h
+++ b/Source/modules/webmidi/MIDIInput.h
@@ -43,13 +43,13 @@ class MIDIInput final : public MIDIPort {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static MIDIInput* create(MIDIAccess*, const String& id, const String& manufacturer, const String& name, const String& version, MIDIAccessor::MIDIPortState);
-    virtual ~MIDIInput() { }
+    ~MIDIInput() override { }
 
     EventListener* onmidimessage();
     void setOnmidimessage(PassRefPtr<EventListener>);
 
     // EventTarget
-    virtual const AtomicString& interfaceName() const override { return EventTargetNames::MIDIInput; }
+    const AtomicString& interfaceName() const override { return EventTargetNames::MIDIInput; }
 
     // |timeStamp| is a DOMHighResTimeStamp in the time coordinate system of performance.now().
     void didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp);