ES6 symbols: turn symbols into a proper primitive type

src/objects.h

 // Copyright 2012 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 1084 matching lines @@
   static Handle<Object> GetElement(Handle<Object> object, uint32_t index);
   MUST_USE_RESULT inline MaybeObject* GetElement(uint32_t index);
   // For use when we know that no exception can be thrown.
   inline Object* GetElementNoExceptionThrown(uint32_t index);
   MUST_USE_RESULT MaybeObject* GetElementWithReceiver(Object* receiver,
                                                       uint32_t index);
 
   // Return the object's prototype (might be Heap::null_value()).
   Object* GetPrototype(Isolate* isolate);
 
-  // Return the prototype, or the method holder for a value-like object.
-  Object* GetDelegate(Isolate* isolate);
-
   // Returns the permanent hash code associated with this object depending on
   // the actual object type.  Might return a failure in case no hash was
   // created yet or GC was caused by creation.
   MUST_USE_RESULT MaybeObject* GetHash(CreationFlag flag);
 
   // Checks whether this object has the same value as the given one.  This
   // function is implemented according to ES5, section 9.12 and can be used
   // to implement the Harmony "egal" function.
   bool SameValue(Object* other);
 
@@ skipping 8143 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_