Add more out of line copy ctors for complex classes.

content/browser/frame_host/frame_tree.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_H_
 #define CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_H_
 
 #include <stdint.h>
 
 #include <iterator>
@@ skipping 65 matching lines @@
     friend class FrameTree;
 
     NodeRange(FrameTreeNode* root, FrameTreeNode* node_to_skip);
 
     FrameTreeNode* const root_;
     FrameTreeNode* const node_to_skip_;
   };
 
   class CONTENT_EXPORT ConstNodeIterator {
    public:
+    ConstNodeIterator(const ConstNodeIterator& other);
     ~ConstNodeIterator();
 
     ConstNodeIterator& operator++();
 
     bool operator==(const ConstNodeIterator& rhs) const;
     bool operator!=(const ConstNodeIterator& rhs) const {
       return !(*this == rhs);
     }
 
     const FrameTreeNode* operator*() { return current_node_; }
@@ skipping 198 matching lines @@
 
   // Overall load progress.
   double load_progress_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameTree);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_H_