Use PluginView type rather than FrameViewBase for v8 Script object.

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 32 matching lines @@
 
 class CORE_EXPORT HTMLPlugInElement : public HTMLFrameOwnerElement {
  public:
   ~HTMLPlugInElement() override;
   DECLARE_VIRTUAL_TRACE();
 
   void resetInstance();
   // TODO(dcheng): Consider removing this, since HTMLEmbedElementLegacyCall
   // and HTMLObjectElementLegacyCall usage is extremely low.
   SharedPersistent<v8::Object>* pluginWrapper();
-  FrameViewBase* pluginWidget() const;
+  PluginView* pluginWidget() const;
   bool canProcessDrag() const;
   const String& url() const { return m_url; }
 
   // Public for FrameView::addPartToUpdate()
   bool needsPluginUpdate() const { return m_needsPluginUpdate; }
   void setNeedsPluginUpdate(bool needsPluginUpdate) {
     m_needsPluginUpdate = needsPluginUpdate;
   }
   void updatePlugin();
 
@@ skipping 121 matching lines @@
 
 inline bool isHTMLPlugInElement(const HTMLElement& element) {
   return element.isPluginElement();
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLPlugInElement);
 
 }  // namespace blink
 
 #endif  // HTMLPlugInElement_h