Add friend declaration.

http://codereview.chromium.org/2024008/show
Committed for evan@chromium.org with apologies for getting
his email address wrong last time.


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4620 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/frames.h

@@ -357,6 +357,7 @@ class StandardFrame: public StackFrame {
 
  private:
   friend class StackFrame;
+  friend class StackFrameIterator;
 };