Migrate vr to use inlined tracing

Source/modules/vr/VREyeParameters.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 VREyeParameters_h
 #define VREyeParameters_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/DOMPoint.h"
 #include "core/dom/DOMRect.h"
@@ skipping 16 matching lines @@
     VRFieldOfView* maximumFieldOfView() const { return m_maximumFieldOfView; }
     VRFieldOfView* recommendedFieldOfView() const { return m_recommendedFieldOfView; }
     DOMPoint* eyeTranslation() const { return m_eyeTranslation; }
     VRFieldOfView* currentFieldOfView() const { return m_currentFieldOfView; }
     DOMRect* renderRect() const { return m_renderRect; }
 
     void setFromWebVREyeParameters(const blink::WebVREyeParameters&);
     void setCurrentFieldOfView(const blink::VRFieldOfView*);
     void setRenderRect(double x, double y, double width, double height);
 
-    virtual void trace(Visitor*);
+    DECLARE_VIRTUAL_TRACE()
 
 private:
     VREyeParameters();
 
     Member<VRFieldOfView> m_minimumFieldOfView;
     Member<VRFieldOfView> m_maximumFieldOfView;
     Member<VRFieldOfView> m_recommendedFieldOfView;
     Member<DOMPoint> m_eyeTranslation;
 
     Member<VRFieldOfView> m_currentFieldOfView;
     Member<DOMRect> m_renderRect;
 };
 
 } // namespace blink
 
 #endif // VREyeParameters_h