Migrate vr to use inlined tracing

Source/modules/vr/NavigatorVRDevice.cpp

 // 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.
 
 #include "config.h"
 #include "modules/vr/NavigatorVRDevice.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/Document.h"
 #include "core/frame/LocalDOMWindow.h"
@@ skipping 69 matching lines @@
     for (size_t i = 0; i < m_hardwareUnits.size(); ++i) {
         hardwareUnit = m_hardwareUnits[i];
         if (hardwareUnit->index() == index) {
             return hardwareUnit;
         }
     }
 
     return 0;
 }
 
-void NavigatorVRDevice::trace(Visitor* visitor)
+DEFINE_TRACE(NavigatorVRDevice)
 {
     visitor->trace(m_hardwareUnits);
 
     WillBeHeapSupplement<Navigator>::trace(visitor);
 }
 
 NavigatorVRDevice::NavigatorVRDevice()
 {
 }
 
 NavigatorVRDevice::~NavigatorVRDevice()
 {
 }
 
 const char* NavigatorVRDevice::supplementName()
 {
     return "NavigatorVRDevice";
 }
 
 } // namespace blink