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

Source/modules/encryptedmedia/MediaKeys.h

 /*
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 36 matching lines @@
 class ScriptState;
 class WebContentDecryptionModule;
 
 // References are held by JS and HTMLMediaElement.
 // The WebContentDecryptionModule has the same lifetime as this object.
 class MediaKeys : public GarbageCollectedFinalized<MediaKeys>, public ActiveDOMObject, public ScriptWrappable {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaKeys);
     DEFINE_WRAPPERTYPEINFO();
 public:
     static MediaKeys* create(ExecutionContext*, const WebVector<WebEncryptedMediaSessionType>& supportedSessionTypes, PassOwnPtr<WebContentDecryptionModule>);
-    virtual ~MediaKeys();
+    ~MediaKeys() override;
 
     MediaKeySession* createSession(ScriptState*, const String& sessionTypeString, ExceptionState&);
 
     ScriptPromise setServerCertificate(ScriptState*, const DOMArrayPiece& serverCertificate);
 
     // Indicates that the provided HTMLMediaElement wants to use this object.
     // Returns true if no other HTMLMediaElement currently references this
     // object, false otherwise. Will take a weak reference to HTMLMediaElement.
     bool setMediaElement(HTMLMediaElement*);
     // Indicates that no HTMLMediaElement is currently using this object.
     void clearMediaElement();
 
     WebContentDecryptionModule* contentDecryptionModule();
 
     DECLARE_VIRTUAL_TRACE();
 
     // ActiveDOMObject implementation.
     // FIXME: This class could derive from ContextLifecycleObserver
     // again once hasPendingActivity() is moved to ScriptWrappable
     // (http://crbug.com/483722).
-    virtual void contextDestroyed() override;
-    virtual bool hasPendingActivity() const override;
-    virtual void stop() override;
+    void contextDestroyed() override;
+    bool hasPendingActivity() const override;
+    void stop() override;
 
 private:
     MediaKeys(ExecutionContext*, const WebVector<WebEncryptedMediaSessionType>& supportedSessionTypes, PassOwnPtr<WebContentDecryptionModule>);
     class PendingAction;
 
     bool sessionTypeSupported(WebEncryptedMediaSessionType);
     void timerFired(Timer<MediaKeys>*);
 
     const WebVector<WebEncryptedMediaSessionType> m_supportedSessionTypes;
     OwnPtr<WebContentDecryptionModule> m_cdm;
 
     // Keep track of the HTMLMediaElement that references this object. Keeping
     // a WeakMember so that HTMLMediaElement's lifetime isn't dependent on
     // this object.
     RawPtrWillBeWeakMember<HTMLMediaElement> m_mediaElement;
 
     HeapDeque<Member<PendingAction>> m_pendingActions;
     Timer<MediaKeys> m_timer;
 };
 
 } // namespace blink
 
 #endif // MediaKeys_h