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

Source/modules/presentation/PresentationAvailabilityCallback.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PresentationAvailabilityCallback_h
 #define PresentationAvailabilityCallback_h
 
 #include "platform/heap/Handle.h"
 #include "public/platform/WebCallbacks.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class ScriptPromiseResolver;
 struct WebPresentationError;
 
 using WebPresentationAvailabilityCallbacks = WebCallbacks<bool, WebPresentationError>;
 
 // PresentationAvailabilityCallback is an implementation of
 // WebPresentationAvailabilityCallbacks that will resolve the underlying promise
 // depending on the result passed to the callback.
 class PresentationAvailabilityCallback final
     : public WebPresentationAvailabilityCallbacks {
     WTF_MAKE_NONCOPYABLE(PresentationAvailabilityCallback);
 public:
     explicit PresentationAvailabilityCallback(PassRefPtrWillBeRawPtr<ScriptPromiseResolver>);
-    virtual ~PresentationAvailabilityCallback() = default;
+    ~PresentationAvailabilityCallback() override = default;
 
     void onSuccess(bool*) override;
     void onError(WebPresentationError*) override;
 
 private:
     RefPtrWillBePersistent<ScriptPromiseResolver> m_resolver;
 };
 
 } // namespace blink
 
 #endif // PresentationAvailabilityCallback_h