Dispose a persisted plugin widget if the content frame is detached.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights
  * reserved.
  *
  * 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 49 matching lines @@
   void setNeedsWidgetUpdate(bool needsWidgetUpdate) {
     m_needsWidgetUpdate = needsWidgetUpdate;
   }
   void updateWidget();
 
   bool shouldAccelerate() const;
 
   void requestPluginCreationWithoutLayoutObjectIfPossible();
   void createPluginWithoutLayoutObject();
 
-  void removedFrom(ContainerNode* insertionPoint) override;
-
  protected:
   HTMLPlugInElement(const QualifiedName& tagName,
                     Document&,
                     bool createdByParser,
                     PreferPlugInsForImagesOption);
 
   // Node functions:
+  void removedFrom(ContainerNode* insertionPoint) override;
   void didMoveToNewDocument(Document& oldDocument) override;
 
   // Element functions:
   bool isPresentationAttribute(const QualifiedName&) const override;
   void collectStyleForPresentationAttribute(const QualifiedName&,
                                             const AtomicString&,
                                             MutableStylePropertySet*) override;
 
   virtual bool hasFallbackContent() const;
   virtual bool useFallbackContent() const;
@@ skipping 19 matching lines @@
   void dispatchErrorEvent();
   void lazyReattachIfNeeded();
 
   String m_serviceType;
   String m_url;
   KURL m_loadedUrl;
   Member<HTMLImageLoader> m_imageLoader;
   bool m_isDelayingLoadEvent;
 
  private:
-  // EventTarget functions:
+  // EventTarget overrides:
   void removeAllEventListeners() final;
 
-  // Node functions:
+  // Node overrides:
   bool canContainRangeEndPoint() const override { return false; }
   bool canStartSelection() const override;
   bool willRespondToMouseClickEvents() final;
   void defaultEventHandler(Event*) final;
   void attachLayoutTree(const AttachContext& = AttachContext()) final;
   void detachLayoutTree(const AttachContext& = AttachContext()) final;
   void finishParsingChildren() final;
 
-  // Element functions:
+  // Element overrides:
   LayoutObject* createLayoutObject(const ComputedStyle&) override;
   bool supportsFocus() const final { return true; }
   bool layoutObjectIsFocusable() const final;
   bool isKeyboardFocusable() const final;
   void didAddUserAgentShadowRoot(ShadowRoot&) final;
 
-  // HTMLElement function:
+  // HTMLElement overrides:
   bool hasCustomFocusLogic() const override;
   bool isPluginElement() const final;
 
+  // HTMLFrameOwnerElement overrides:
+  void disconnectContentFrame() override;
+
   // Return any existing LayoutPart without triggering relayout, or 0 if it
   // doesn't yet exist.
   virtual LayoutPart* existingLayoutPart() const = 0;
   virtual void updateWidgetInternal() = 0;
 
   bool loadPlugin(const KURL&,
                   const String& mimeType,
                   const Vector<String>& paramNames,
                   const Vector<String>& paramValues,
                   bool useFallback,
@@ skipping 30 matching lines @@
 
 inline bool isHTMLPlugInElement(const HTMLElement& element) {
   return element.isPluginElement();
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLPlugInElement);
 
 }  // namespace blink
 
 #endif  // HTMLPlugInElement_h