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

Source/modules/encryptedmedia/MediaKeySession.h

Index: Source/modules/encryptedmedia/MediaKeySession.h
diff --git a/Source/modules/encryptedmedia/MediaKeySession.h b/Source/modules/encryptedmedia/MediaKeySession.h
index 49b7f5d5d69aefefb2f8e86dac0fdd607f1cf27b..be4a635d2822f546ca3ee7095223bea9a4bf7ddd 100644
--- a/Source/modules/encryptedmedia/MediaKeySession.h
+++ b/Source/modules/encryptedmedia/MediaKeySession.h
@@ -67,7 +67,7 @@ class MediaKeySession final
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaKeySession);
 public:
     static MediaKeySession* create(ScriptState*, MediaKeys*, WebEncryptedMediaSessionType);
-    virtual ~MediaKeySession();
+    ~MediaKeySession() override;
 
     String sessionId() const;
     double expiration() const { return m_expiration; }
@@ -82,12 +82,12 @@ public:
     ScriptPromise remove(ScriptState*);
 
     // EventTarget
-    virtual const AtomicString& interfaceName() const override;
-    virtual ExecutionContext* executionContext() const override;
+    const AtomicString& interfaceName() const override;
+    ExecutionContext* executionContext() const override;
 
     // ActiveDOMObject
-    virtual bool hasPendingActivity() const override;
-    virtual void stop() override;
+    bool hasPendingActivity() const override;
+    void stop() override;
 
     // Oilpan: eagerly release owned m_session, which in turn
     // drops the client reference back to this MediaKeySession object.
@@ -104,10 +104,10 @@ private:
     void actionTimerFired(Timer<MediaKeySession>*);
 
     // WebContentDecryptionModuleSession::Client
-    virtual void message(MessageType, const unsigned char* message, size_t messageLength) override;
-    virtual void close() override;
-    virtual void expirationChanged(double updatedExpiryTimeInMS) override;
-    virtual void keysStatusesChange(const WebVector<WebEncryptedMediaKeyInformation>&, bool hasAdditionalUsableKey) override;
+    void message(MessageType, const unsigned char* message, size_t messageLength) override;
+    void close() override;
+    void expirationChanged(double updatedExpiryTimeInMS) override;
+    void keysStatusesChange(const WebVector<WebEncryptedMediaKeyInformation>&, bool hasAdditionalUsableKey) override;
 
     // Called by NewSessionResult when the new session has been created.
     void finishGenerateRequest();