Oilpan: hide persisted plugin object before disposing.

third_party/WebKit/Source/core/html/HTMLPlugInElement.cpp

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 96 matching lines @@
 }
 #endif
 
 void HTMLPlugInElement::setPersistedPluginWidget(Widget* widget)
 {
     if (m_persistedPluginWidget == widget)
         return;
 #if ENABLE(OILPAN)
     unregisterAsRenderlessIfNeeded();
     registerAsRenderless(widget);
-    if (m_persistedPluginWidget)
+    if (m_persistedPluginWidget) {
+        m_persistedPluginWidget->hide();
         m_persistedPluginWidget->dispose();
+    }
 #endif
     m_persistedPluginWidget = widget;
 }
 
 #if ENABLE(OILPAN)
 bool HTMLPlugInElement::unregisterAsRenderlessIfNeeded()
 {
     if (!m_persistedPluginWidget || !m_persistedPluginWidget->isPluginView())
         return false;
 
@@ skipping 532 matching lines @@
     return openShadowRoot();
 }
 
 void HTMLPlugInElement::lazyReattachIfNeeded()
 {
     if (!useFallbackContent() && needsWidgetUpdate() && layoutObject() && !isImageType())
         lazyReattachIfAttached();
 }
 
 }