Remove most of Widget (FrameViewBase) class from HTMLPlugInElement.

third_party/WebKit/Source/core/html/PluginDocument.cpp

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 140 matching lines @@
   if (PluginView* view = pluginView())
     view->didReceiveData(data, length);
 }
 
 void PluginDocumentParser::finish() {
   m_embedElement = nullptr;
   RawDataDocumentParser::finish();
 }
 
 PluginView* PluginDocumentParser::pluginView() const {
-  if (FrameViewBase* frameViewBase =
-          toPluginDocument(document())->pluginWidget()) {
-    SECURITY_DCHECK(frameViewBase->isPluginContainer());
-    return toPluginView(frameViewBase);
-  }
-  return 0;
+  return toPluginDocument(document())->pluginView();
 }
 
 PluginDocument::PluginDocument(const DocumentInit& initializer)
     : HTMLDocument(initializer, PluginDocumentClass) {
   setCompatibilityMode(QuirksMode);
   lockCompatibilityMode();
   UseCounter::count(*this, UseCounter::PluginDocument);
   if (!isInMainFrame())
     UseCounter::count(*this, UseCounter::PluginDocumentInFrame);
 }
 
 DocumentParser* PluginDocument::createParser() {
   return PluginDocumentParser::create(this);
 }
 
-FrameViewBase* PluginDocument::pluginWidget() {
+PluginView* PluginDocument::pluginView() {
   if (m_pluginNode && m_pluginNode->layoutObject()) {
     CHECK(m_pluginNode->layoutObject()->isEmbeddedObject());
     FrameViewBase* frameViewBase =
         toLayoutEmbeddedObject(m_pluginNode->layoutObject())->frameViewBase();
     if (!frameViewBase || !frameViewBase->isPluginContainer())
       return nullptr;
-    return frameViewBase;
+    return toPluginView(frameViewBase);
   }
   return 0;
 }
 
 Node* PluginDocument::pluginNode() {
   return m_pluginNode.get();
 }
 
 void PluginDocument::shutdown() {
   // Release the plugin node so that we don't have a circular reference.
   m_pluginNode = nullptr;
   HTMLDocument::shutdown();
 }
 
 DEFINE_TRACE(PluginDocument) {
   visitor->trace(m_pluginNode);
   HTMLDocument::trace(visitor);
 }
 
 }  // namespace blink