Changed Object.keys to return strings for element indices.

src/heap.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 864 matching lines @@
 
 #define SYMBOL_INDEX_DECLARATION(name, str) k##name##RootIndex,
     SYMBOL_LIST(SYMBOL_INDEX_DECLARATION)
 #undef SYMBOL_DECLARATION
 
     kSymbolTableRootIndex,
     kStrongRootListLength = kSymbolTableRootIndex,
     kRootListLength
   };
 
+  static Object* NumberToString(Object* number);
+
  private:
   static int semispace_size_;
   static int initial_semispace_size_;
   static int young_generation_size_;
   static int old_generation_size_;
 
   // For keeping track of how much data has survived
   // scavenge since last new space expansion.
   static int survived_since_last_expansion_;
 
@@ skipping 694 matching lines @@
   }
   static TranscendentalCache* caches_[kNumberOfCaches];
   Element elements_[kCacheSize];
   Type type_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_