Oilpan: have Navigator and its supplements be on the heap by default.

Source/modules/vr/NavigatorVRDevice.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 NavigatorVRDevice_h
 #define NavigatorVRDevice_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/frame/DOMWindowProperty.h"
 #include "modules/ModulesExport.h"
 #include "modules/vr/VRDevice.h"
 #include "modules/vr/VRHardwareUnit.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebVector.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class Document;
 class Navigator;
 class VRController;
 class VRHardwareUnitCollection;
 
-class MODULES_EXPORT NavigatorVRDevice final : public NoBaseWillBeGarbageCollectedFinalized<NavigatorVRDevice>, public WillBeHeapSupplement<Navigator>, public DOMWindowProperty {
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NavigatorVRDevice);
+// TODO(Oilpan): when ~DOMWindowProperty is removed, derive from GarbageCollected<> instead.
+class MODULES_EXPORT NavigatorVRDevice final : public GarbageCollectedFinalized<NavigatorVRDevice>, public HeapSupplement<Navigator>, DOMWindowProperty {
+    USING_GARBAGE_COLLECTED_MIXIN(NavigatorVRDevice);
     WTF_MAKE_NONCOPYABLE(NavigatorVRDevice);
 public:
     static NavigatorVRDevice* from(Document&);
     static NavigatorVRDevice& from(Navigator&);
     virtual ~NavigatorVRDevice();
 
     static ScriptPromise getVRDevices(ScriptState*, Navigator&);
     ScriptPromise getVRDevices(ScriptState*);
 
     VRController* controller();
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     friend class VRHardwareUnit;
     friend class VRGetDevicesCallback;
 
     explicit NavigatorVRDevice(LocalFrame*);
 
     static const char* supplementName();
 
-    RefPtrWillBeMember<VRHardwareUnitCollection> m_hardwareUnits;
+    Member<VRHardwareUnitCollection> m_hardwareUnits;
 };
 
 } // namespace blink
 
 #endif // NavigatorVRDevice_h