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

Source/modules/encryptedmedia/MediaKeySession.cpp

 /*
  * 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 207 matching lines @@
 // completeWithError() will reject the promise with an exception. complete()
 // is not expected to be called, and will reject the promise.
 class NewSessionResultPromise : public ContentDecryptionModuleResultPromise {
 public:
     NewSessionResultPromise(ScriptState* scriptState, MediaKeySession* session)
         : ContentDecryptionModuleResultPromise(scriptState)
         , m_session(session)
     {
     }
 
-    virtual ~NewSessionResultPromise()
+    ~NewSessionResultPromise() override
     {
     }
 
     // ContentDecryptionModuleResult implementation.
-    virtual void completeWithSession(WebContentDecryptionModuleResult::SessionStatus status) override
+    void completeWithSession(WebContentDecryptionModuleResult::SessionStatus status) override
     {
         if (status != WebContentDecryptionModuleResult::NewSession) {
             ASSERT_NOT_REACHED();
             reject(InvalidStateError, "Unexpected completion.");
         }
 
         m_session->finishGenerateRequest();
         resolve();
     }
 
@@ skipping 13 matching lines @@
 // completeWithError() will reject the promise with an exception. complete()
 // is not expected to be called, and will reject the promise.
 class LoadSessionResultPromise : public ContentDecryptionModuleResultPromise {
 public:
     LoadSessionResultPromise(ScriptState* scriptState, MediaKeySession* session)
         : ContentDecryptionModuleResultPromise(scriptState)
         , m_session(session)
     {
     }
 
-    virtual ~LoadSessionResultPromise()
+    ~LoadSessionResultPromise() override
     {
     }
 
     // ContentDecryptionModuleResult implementation.
-    virtual void completeWithSession(WebContentDecryptionModuleResult::SessionStatus status) override
+    void completeWithSession(WebContentDecryptionModuleResult::SessionStatus status) override
     {
         switch (status) {
         case WebContentDecryptionModuleResult::NewSession:
             m_session->finishLoad();
             resolve(true);
             return;
 
         case WebContentDecryptionModuleResult::SessionNotFound:
             resolve(false);
             return;
@@ skipping 640 matching lines @@
     visitor->trace(m_asyncEventQueue);
     visitor->trace(m_pendingActions);
     visitor->trace(m_mediaKeys);
     visitor->trace(m_keyStatusesMap);
     visitor->trace(m_closedPromise);
     RefCountedGarbageCollectedEventTargetWithInlineData<MediaKeySession>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink