Remove unused fields from //content.

content/browser/frame_host/frame_tree_node.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_
 #define CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 38 matching lines @@
 
   // Returns the FrameTreeNode with the given global |frame_tree_node_id|,
   // regardless of which FrameTree it is in.
   static FrameTreeNode* GloballyFindByID(int frame_tree_node_id);
 
   // Callers are are expected to initialize sandbox flags separately after
   // calling the constructor.
   FrameTreeNode(FrameTree* frame_tree,
                 Navigator* navigator,
                 RenderFrameHostDelegate* render_frame_delegate,
-                RenderViewHostDelegate* render_view_delegate,
                 RenderWidgetHostDelegate* render_widget_delegate,
                 RenderFrameHostManager::Delegate* manager_delegate,
                 blink::WebTreeScopeType scope,
                 const std::string& name,
                 const std::string& unique_name,
                 const blink::WebFrameOwnerProperties& frame_owner_properties);
 
   ~FrameTreeNode();
 
   void AddObserver(Observer* observer);
@@ skipping 277 matching lines @@
   base::ObserverList<Observer> observers_;
 
   base::TimeTicks last_focus_time_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameTreeNode);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_