Oilpan: Move the EventListener hierarchy to Oilpan's heap

Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 736 matching lines @@
     bool m_continuousPaintingEnabled;
     WebColor m_baseBackgroundColor;
     WebColor m_backgroundColorOverride;
     float m_zoomFactorOverride;
 
     bool m_userGestureObserved;
     WebDisplayMode m_displayMode;
 
     FloatSize m_elasticOverscroll;
 
-    RefPtr<EventListener> m_popupMouseWheelEventListener;
+    RefPtrWillBePersistent<EventListener> m_popupMouseWheelEventListener;
 };
 
 DEFINE_TYPE_CASTS(WebViewImpl, WebWidget, widget, widget->isWebView(), widget.isWebView());
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif