Revert of Limit the usage of SharedPersistent to ScriptValue only

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 56 matching lines @@
     // the same codepath in this class.
     , m_needsWidgetUpdate(!createdByParser)
     , m_shouldPreferPlugInsForImages(preferPlugInsForImagesOption == ShouldPreferPlugInsForImages)
     , m_displayState(Playing)
 {
     setHasCustomStyleCallbacks();
 }
 
 HTMLPlugInElement::~HTMLPlugInElement()
 {
-    ASSERT(m_pluginWrapper.hasNoValue()); // cleared in detach()
+    ASSERT(!m_pluginWrapper); // cleared in detach()
     ASSERT(!m_isDelayingLoadEvent);
 
     if (m_NPObject) {
         _NPN_ReleaseObject(m_NPObject);
         m_NPObject = 0;
     }
 }
 
 bool HTMLPlugInElement::canProcessDrag() const
 {
@@ skipping 114 matching lines @@
     setNeedsWidgetUpdate(true);
     if (inDocument())
         setNeedsStyleRecalc();
 }
 
 void HTMLPlugInElement::resetInstance()
 {
     m_pluginWrapper.clear();
 }
 
-ScriptValue HTMLPlugInElement::pluginWrapper()
+SharedPersistent<v8::Object>* HTMLPlugInElement::pluginWrapper()
 {
     Frame* frame = document().frame();
     if (!frame)
-        return ScriptValue();
+        return 0;
 
     // If the host dynamically turns off JavaScript (or Java) we will still
     // return the cached allocated Bindings::Instance. Not supporting this
     // edge-case is OK.
-    if (m_pluginWrapper.hasNoValue()) {
+    if (!m_pluginWrapper) {
         if (Widget* widget = pluginWidget())
             m_pluginWrapper = frame->script().createPluginWrapper(widget);
     }
-    return m_pluginWrapper;
+    return m_pluginWrapper.get();
 }
 
 bool HTMLPlugInElement::dispatchBeforeLoadEvent(const String& sourceURL)
 {
     // FIXME: Our current plug-in loading design can't guarantee the following
     // assertion is true, since plug-in loading can be initiated during layout,
     // and synchronous layout can be initiated in a beforeload event handler!
     // See <http://webkit.org/b/71264>.
     // ASSERT(!m_inBeforeLoadEventHandler);
     m_inBeforeLoadEventHandler = true;
@@ skipping 289 matching lines @@
     if (root.isOldestAuthorShadowRoot())
         lazyReattachIfAttached();
 }
 
 bool HTMLPlugInElement::useFallbackContent() const
 {
     return hasAuthorShadowRoot();
 }
 
 }