Fix assertion while marking Harmony weak maps.

src/objects.h

 // Copyright 2011 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 7279 matching lines @@
 
 // The JSWeakMap describes EcmaScript Harmony weak maps
 class JSWeakMap: public JSObject {
  public:
   // [table]: the backing hash table mapping keys to values.
   DECL_ACCESSORS(table, Object)
 
   // [next]: linked list of encountered weak maps during GC.
   DECL_ACCESSORS(next, Object)
 
-  // Unchecked accessors to be used during GC.
-  inline ObjectHashTable* unchecked_table();
-
   // Casting.
   static inline JSWeakMap* cast(Object* obj);
 
 #ifdef OBJECT_PRINT
   inline void JSWeakMapPrint() {
     JSWeakMapPrint(stdout);
   }
   void JSWeakMapPrint(FILE* out);
 #endif
 #ifdef DEBUG
@@ skipping 649 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_