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

Source/modules/device_light/DeviceLightController.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 DeviceLightController_h
 #define DeviceLightController_h
 
 #include "core/dom/Document.h"
 #include "core/frame/DeviceSingleWindowEventController.h"
 #include "modules/ModulesExport.h"
 
 namespace blink {
 
 class Event;
 
 class MODULES_EXPORT DeviceLightController final : public DeviceSingleWindowEventController, public WillBeHeapSupplement<Document> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DeviceLightController);
 public:
-    virtual ~DeviceLightController();
+    ~DeviceLightController() override;
 
     static const char* supplementName();
     static DeviceLightController& from(Document&);
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit DeviceLightController(Document&);
 
     // Inherited from DeviceEventControllerBase.
-    virtual void registerWithDispatcher() override;
-    virtual void unregisterWithDispatcher() override;
-    virtual bool hasLastData() override;
+    void registerWithDispatcher() override;
+    void unregisterWithDispatcher() override;
+    bool hasLastData() override;
 
     // Inherited from DeviceSingleWindowEventController.
-    virtual PassRefPtrWillBeRawPtr<Event> lastEvent() const override;
-    virtual const AtomicString& eventTypeName() const override;
-    virtual bool isNullEvent(Event*) const override;
+    PassRefPtrWillBeRawPtr<Event> lastEvent() const override;
+    const AtomicString& eventTypeName() const override;
+    bool isNullEvent(Event*) const override;
 };
 
 } // namespace blink
 
 #endif // DeviceLightController_h