Hide Symbol implementation in a closure.

src/mirror-debugger.js

 // Copyright 2006-2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 "use strict";
 
 // Handle id counters.
 var next_handle_ = 0;
 var next_transient_handle_ = -1;
 
 // Mirror cache.
@@ skipping 639 matching lines @@
 }
 inherits(SymbolMirror, ValueMirror);
 
 
 SymbolMirror.prototype.description = function() {
   return %SymbolDescription(%_ValueOf(this.value_));
 }
 
 
 SymbolMirror.prototype.toText = function() {
-  return %_CallFunction(this.value_, builtins.SymbolToString);
+  return %_CallFunction(this.value_, builtins.$symbolToString);
 }
 
 
 /**
  * Mirror object for objects.
  * @param {object} value The object reflected by this mirror
  * @param {boolean} transient indicate whether this object is transient with a
  *    transient handle
  * @constructor
  * @extends ValueMirror
@@ skipping 2391 matching lines @@
   }
   if (!NUMBER_IS_FINITE(value)) {
     if (value > 0) {
       return 'Infinity';
     } else {
       return '-Infinity';
     }
   }
   return value;
 }