Add out-of-line copy ctor to Maps::Iterator.

maps.h

 // Copyright (c) 2010 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 MAPS_H__
 #define MAPS_H__
 
 #include <elf.h>
 #include <functional>
 #include <map>
@@ skipping 31 matching lines @@
   friend class Iterator;
   class Iterator {
     friend class Maps;
 
    protected:
     explicit Iterator(Maps* maps);
     Iterator(Maps* maps, bool at_beginning, bool at_end);
     Maps::LibraryMap::iterator& getIterator() const;
 
    public:
+    Iterator(const Iterator& other);
     Iterator begin();
     Iterator end();
     Iterator& operator++();
     Iterator operator++(int i);
     Library* operator*() const;
     bool operator==(const Iterator& iter) const;
     bool operator!=(const Iterator& iter) const;
     const string& name() const;
 
    protected:
@@ skipping 23 matching lines @@
   const Iterator begin_iter_;
   const Iterator end_iter_;
 
   LibraryMap     libs_;
   char*          vsyscall_;
 };
 
 } // namespace
 
 #endif // MAPS_H__