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

Source/modules/encryptedmedia/NavigatorRequestMediaKeySystemAccess.cpp

 // 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.
 
 #include "config.h"
 #include "modules/encryptedmedia/NavigatorRequestMediaKeySystemAccess.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
@@ skipping 66 matching lines @@
     return result;
 }
 
 // This class allows capabilities to be checked and a MediaKeySystemAccess
 // object to be created asynchronously.
 class MediaKeySystemAccessInitializer final : public EncryptedMediaRequest {
     WTF_MAKE_NONCOPYABLE(MediaKeySystemAccessInitializer);
 
 public:
     MediaKeySystemAccessInitializer(ScriptState*, const String& keySystem, const HeapVector<MediaKeySystemConfiguration>& supportedConfigurations);
-    virtual ~MediaKeySystemAccessInitializer() { }
+    ~MediaKeySystemAccessInitializer() override { }
 
     // EncryptedMediaRequest implementation.
-    virtual WebString keySystem() const override { return m_keySystem; }
-    virtual const WebVector<WebMediaKeySystemConfiguration>& supportedConfigurations() const override { return m_supportedConfigurations; }
-    virtual SecurityOrigin* securityOrigin() const override { return m_resolver->executionContext()->securityOrigin(); }
-    virtual void requestSucceeded(WebContentDecryptionModuleAccess*) override;
-    virtual void requestNotSupported(const WebString& errorMessage) override;
+    WebString keySystem() const override { return m_keySystem; }
+    const WebVector<WebMediaKeySystemConfiguration>& supportedConfigurations() const override { return m_supportedConfigurations; }
+    SecurityOrigin* securityOrigin() const override { return m_resolver->executionContext()->securityOrigin(); }
+    void requestSucceeded(WebContentDecryptionModuleAccess*) override;
+    void requestNotSupported(const WebString& errorMessage) override;
 
     ScriptPromise promise() { return m_resolver->promise(); }
 
 private:
     RefPtr<ScriptPromiseResolver> m_resolver;
     const String m_keySystem;
     WebVector<WebMediaKeySystemConfiguration> m_supportedConfigurations;
 };
 
 MediaKeySystemAccessInitializer::MediaKeySystemAccessInitializer(ScriptState* scriptState, const String& keySystem, const HeapVector<MediaKeySystemConfiguration>& supportedConfigurations)
@@ skipping 98 matching lines @@
     //    initialize the MediaKeySystemAccess object.
     MediaKeysController* controller = MediaKeysController::from(document->page());
     WebEncryptedMediaClient* mediaClient = controller->encryptedMediaClient(executionContext);
     mediaClient->requestMediaKeySystemAccess(WebEncryptedMediaRequest(initializer));
 
     // 8. Return promise.
     return promise;
 }
 
 } // namespace blink