Does anyone need copy constructor for StackFrameIterator?

src/frames.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 492 matching lines @@
     ASSERT(!done());
     return frame_;
   }
 
   bool done() const { return frame_ == NULL; }
   void Advance() { (this->*advance_)(); }
 
   // Go back to the first frame.
   void Reset();
 
+  StackFrameIterator(const StackFrameIterator& original);
+  void operator=(const StackFrameIterator& original);
+
  private:
 #define DECLARE_SINGLETON(ignore, type) type type##_;
   STACK_FRAME_TYPE_LIST(DECLARE_SINGLETON)
 #undef DECLARE_SINGLETON
   StackFrame* frame_;
   StackHandler* handler_;
   ThreadLocalTop* thread_;
   Address fp_;
   Address sp_;
   void (StackFrameIterator::*advance_)();
 
   StackHandler* handler() const {
     ASSERT(!done());
     return handler_;
   }
 
   // Get the type-specific frame singleton in a given state.
   StackFrame* SingletonFor(StackFrame::Type type, StackFrame::State* state);
   // A helper function, can return a NULL pointer.
   StackFrame* SingletonFor(StackFrame::Type type);
 
   void AdvanceWithHandler();
   void AdvanceWithoutHandler();
 
   friend class StackFrame;
   friend class SafeStackFrameIterator;
-  DISALLOW_COPY_AND_ASSIGN(StackFrameIterator);
 };
 
 
+bool operator==(const StackFrameIterator& one,
+    const StackFrameIterator& another);
+
+
 // Iterator that supports iterating through all JavaScript frames.
 template<typename Iterator>
 class JavaScriptFrameIteratorTemp BASE_EMBEDDED {
  public:
   JavaScriptFrameIteratorTemp() { if (!done()) Advance(); }
 
   explicit JavaScriptFrameIteratorTemp(ThreadLocalTop* thread) :
       iterator_(thread) {
     if (!done()) Advance();
   }
@@ skipping 101 matching lines @@
   JavaScriptFrame* FindJavaScriptFrame(int n);
 
  private:
   StackFrameIterator iterator_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_H_