Revert changes 601 and 602. TBR

src/property.h

Index: src/property.h
===================================================================
--- src/property.h	(revision 602)
+++ src/property.h	(working copy)
@@ -99,10 +99,7 @@
   friend class DescriptorArray;
 };
 
-// A pointer from a map to the new map that is created by adding
-// a named property.  These are key to the speed and functioning of V8.
-// The two maps should always have the same prototype, since
-// MapSpace::CreateBackPointers depends on this.
+
 class MapTransitionDescriptor: public Descriptor {
  public:
   MapTransitionDescriptor(String* key, Map* map, PropertyAttributes attributes)