Does anyone need copy constructor for StackFrameIterator?

src/frames.h

Index: src/frames.h
diff --git a/src/frames.h b/src/frames.h
index 8cbbc6267978b5929277e97787a684ee3167dcb0..b7821e69c69af79a7cff325203fd3266061a9c8a 100644
--- a/src/frames.h
+++ b/src/frames.h
@@ -510,6 +510,9 @@ class StackFrameIterator BASE_EMBEDDED {
   // 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)
@@ -536,10 +539,13 @@ class StackFrameIterator BASE_EMBEDDED {
 
   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 {