Simplify HTMLPlugInElement::PluginWrapper to not use SharedPersistent.

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 SetFocused(bool, WebFocusType) override;
   void ResetInstance();
   // TODO(dcheng): Consider removing this, since HTMLEmbedElementLegacyCall
   // and HTMLObjectElementLegacyCall usage is extremely low.
-  SharedPersistent<v8::Object>* PluginWrapper();
+  v8::Local<v8::Object> PluginWrapper();
   // TODO(joelhockey): Clean up pluginWidget and plugin (maybe also
   // pluginWrapper).  It would be good to remove and/or rename some of these.
   // pluginWidget and plugin both return the plugin that is stored on this
   // element.  However pluginWidget will synchronously create the plugin if
   // required by calling layoutPartForJSBindings.  Possibly the pluginWidget
   // code can be inlined into pluginWrapper.
   PluginView* PluginWidget() const;
   PluginView* Plugin() const;
   bool CanProcessDrag() const;
   const String& Url() const { return url_; }
@@ skipping 103 matching lines @@
 
   void SetPlugin(PluginView*);
   PluginView* ReleasePlugin();
   void SetPersistedPlugin(PluginView*);
 
   bool RequestObjectInternal(const String& url,
                              const String& mime_type,
                              const Vector<String>& param_names,
                              const Vector<String>& param_values);
 
-  mutable RefPtr<SharedPersistent<v8::Object>> plugin_wrapper_;
+  v8::Global<v8::Object> plugin_wrapper_;
   bool needs_plugin_update_;
   bool should_prefer_plug_ins_for_images_;
   // Represents |layoutObject() && layoutObject()->isEmbeddedObject() &&
   // !layoutEmbeddedItem().showsUnavailablePluginIndicator()|.  We want to
   // avoid accessing |layoutObject()| in layoutObjectIsFocusable().
   bool plugin_is_available_ = false;
 
   Member<PluginView> plugin_;
   // Normally the plugin is stored in HTMLFrameOwnerElement::m_widget.
   // However, plugins can persist even when not rendered. In order to
   // prevent confusing code which may assume that ownedWidget() != null
   // means the frame is active, we save off m_widget here while
   // the plugin is persisting but not being displayed.
   Member<PluginView> persisted_plugin_;
 };
 
 inline bool IsHTMLPlugInElement(const HTMLElement& element) {
   return element.IsPluginElement();
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLPlugInElement);
 
 }  // namespace blink
 
 #endif  // HTMLPlugInElement_h