[merge to M53] Make sure Widget::dispose() respects UpdateSuspendScope.

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 71 matching lines @@
     HTMLFrameOwnerElement::trace(visitor);
 }
 
 void HTMLPlugInElement::setPersistedPluginWidget(Widget* widget)
 {
     if (m_persistedPluginWidget == widget)
         return;
     if (m_persistedPluginWidget) {
         if (m_persistedPluginWidget->isPluginView()) {
             m_persistedPluginWidget->hide();
-            m_persistedPluginWidget->dispose();
+            disposeWidgetSoon(m_persistedPluginWidget.release());
         } else {
             ASSERT(m_persistedPluginWidget->isFrameView() || m_persistedPluginWidget->isRemoteFrameView());
         }
     }
     m_persistedPluginWidget = widget;
 }
 
 bool HTMLPlugInElement::canProcessDrag() const
 {
     return pluginWidget() && pluginWidget()->isPluginView() && toPluginView(pluginWidget())->canProcessDrag();
@@ skipping 501 matching lines @@
 
 void HTMLPlugInElement::lazyReattachIfNeeded()
 {
     if (!useFallbackContent() && needsWidgetUpdate() && layoutObject() && !isImageType()) {
         lazyReattachIfAttached();
         setPersistedPluginWidget(nullptr);
     }
 }
 
 } // namespace blink