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

Source/modules/vr/HMDVRDevice.h

 // Copyright 2015 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 HMDVRDevice_h
 #define HMDVRDevice_h
 
 #include "modules/vr/VRDevice.h"
 #include "modules/vr/VREyeParameters.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/vr/WebVR.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class VRFieldOfView;
 
 class HMDVRDevice final : public VRDevice {
     DEFINE_WRAPPERTYPEINFO();
 public:
     HMDVRDevice(VRHardwareUnit*, unsigned);
 
-    virtual void updateFromWebVRDevice(const WebVRDevice&) override;
+    void updateFromWebVRDevice(const WebVRDevice&) override;
 
     VREyeParameters* getEyeParameters(const String&);
     void setFieldOfView(VRFieldOfView* leftFov = 0, VRFieldOfView* rightFov = 0);
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     Member<VREyeParameters> m_eyeParametersLeft;
     Member<VREyeParameters> m_eyeParametersRight;
 };
 
 } // namespace blink
 
 #endif // HMDVRDevice_h