Oilpan: make DOMWindowProperty a GC mixin.

Source/modules/netinfo/NavigatorNetworkInformation.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 NavigatorNetworkInformation_h
 #define NavigatorNetworkInformation_h
 
 #include "core/frame/DOMWindowProperty.h"
 #include "platform/Supplementable.h"
 
 namespace blink {
 
 class Navigator;
 class NetworkInformation;
 
 class NavigatorNetworkInformation FINAL
-    : public NoBaseWillBeGarbageCollectedFinalized<NavigatorNetworkInformation>
+    : public NoBaseWillBeGarbageCollected<NavigatorNetworkInformation>
     , public WillBeHeapSupplement<Navigator>
     , DOMWindowProperty {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NavigatorNetworkInformation);
-
+    DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(NavigatorNetworkInformation);
 public:
-    virtual ~NavigatorNetworkInformation();
     static NavigatorNetworkInformation& from(Navigator&);
     static NavigatorNetworkInformation* toNavigatorNetworkInformation(Navigator&);
     static const char* supplementName();
 
     static NetworkInformation* connection(Navigator&);
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
     explicit NavigatorNetworkInformation(Navigator&);
     NetworkInformation* connection();
 
     PersistentWillBeMember<NetworkInformation> m_connection;
 };
 
 } // namespace blink
 
 #endif // NavigatorNetworkInformation_h