Move the logic to retrieve the WebPluginContainer to LocalFrame and Node.

third_party/WebKit/Source/core/dom/Node.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004-2011, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 56 matching lines @@
 class LayoutObject;
 class ComputedStyle;
 class SVGQualifiedName;
 class ShadowRoot;
 template <typename NodeType>
 class StaticNodeTypeList;
 using StaticNodeList = StaticNodeTypeList<Node>;
 class StyleChangeReasonForTracing;
 class Text;
 class WebMouseEvent;
+class WebPluginContainerBase;
 
 const int kNodeStyleChangeShift = 18;
 const int kNodeCustomElementShift = 20;
 
 enum StyleChangeType {
   kNoStyleChange = 0,
   kLocalStyleChange = 1 << kNodeStyleChangeShift,
   kSubtreeStyleChange = 2 << kNodeStyleChangeShift,
   kNeedsReattachStyleChange = 3 << kNodeStyleChangeShift,
 };
@@ skipping 735 matching lines @@
   }
 
   void CheckSlotChange(SlotChangeType);
   void CheckSlotChangeAfterInserted() {
     CheckSlotChange(SlotChangeType::kInitial);
   }
   void CheckSlotChangeBeforeRemoved() {
     CheckSlotChange(SlotChangeType::kInitial);
   }
 
+  // If the node is a plugin, then this returns its WebPluginContainerBase.
+  WebPluginContainerBase* GetWebPluginContainerBase() const;
+
   DECLARE_VIRTUAL_TRACE();
 
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
  private:
   enum NodeFlags {
     kHasRareDataFlag = 1,
 
     // Node type flags. These never change once created.
     kIsTextFlag = 1 << 1,
@@ skipping 206 matching lines @@
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showNode(const blink::Node*);
 void showTree(const blink::Node*);
 void showNodePath(const blink::Node*);
 #endif
 
 #endif  // Node_h