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

Source/modules/push_messaging/PushEvent.h

 // Copyright 2014 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 PushEvent_h
 #define PushEvent_h
 
 #include "modules/EventModules.h"
 #include "modules/ModulesExport.h"
 #include "modules/push_messaging/PushEventInit.h"
@@ skipping 14 matching lines @@
     }
     static PassRefPtrWillBeRawPtr<PushEvent> create(const AtomicString& type, PushMessageData* data, WaitUntilObserver* observer)
     {
         return adoptRefWillBeNoop(new PushEvent(type, data, observer));
     }
     static PassRefPtrWillBeRawPtr<PushEvent> create(const AtomicString& type, const PushEventInit& initializer)
     {
         return adoptRefWillBeNoop(new PushEvent(type, initializer));
     }
 
-    virtual ~PushEvent();
+    ~PushEvent() override;
 
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
 
     PushMessageData* data();
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     PushEvent();
     PushEvent(const AtomicString& type, PushMessageData*, WaitUntilObserver*);
     PushEvent(const AtomicString& type, const PushEventInit&);
 
     PersistentWillBeMember<PushMessageData> m_data;
 };
 
 } // namespace blink
 
 #endif // PushEvent_h