Move plugins to be stored in HTMLPlugInElement.

third_party/WebKit/Source/core/paint/EmbeddedObjectPaintInvalidator.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/EmbeddedObjectPaintInvalidator.h"
 
 #include "core/layout/LayoutEmbeddedObject.h"
 #include "core/paint/BoxPaintInvalidator.h"
 #include "core/plugins/PluginView.h"
 
 namespace blink {
 
 PaintInvalidationReason
 EmbeddedObjectPaintInvalidator::invalidatePaintIfNeeded() {
   PaintInvalidationReason reason =
       BoxPaintInvalidator(m_embeddedObject, m_context)
           .invalidatePaintIfNeeded();
 
-  FrameViewBase* frameViewBase = m_embeddedObject.frameViewBase();
-  if (frameViewBase && frameViewBase->isPluginView())
-    toPluginView(frameViewBase)->invalidatePaintIfNeeded();
+  PluginView* plugin = m_embeddedObject.plugin();
+  if (plugin)
+    plugin->invalidatePaintIfNeeded();
 
   return reason;
 }
 
 }  // namespace blink