All private symbols are own symbols

src/messages.js

 // Copyright 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.
 
 // -------------------------------------------------------------------
 
 var $errorToString;
 var $getStackTraceLine;
 var $messageGetPositionInLine;
 var $messageGetLineNumber;
@@ skipping 525 matching lines @@
 }
 
 
 function GetStackTraceLine(recv, fun, pos, isGlobal) {
   return new CallSite(recv, fun, pos, false).toString();
 }
 
 // ----------------------------------------------------------------------------
 // Error implementation
 
-var CallSiteReceiverKey = NEW_PRIVATE_OWN("CallSite#receiver");
-var CallSiteFunctionKey = NEW_PRIVATE_OWN("CallSite#function");
-var CallSitePositionKey = NEW_PRIVATE_OWN("CallSite#position");
-var CallSiteStrictModeKey = NEW_PRIVATE_OWN("CallSite#strict_mode");
+var CallSiteReceiverKey = NEW_PRIVATE("CallSite#receiver");
+var CallSiteFunctionKey = NEW_PRIVATE("CallSite#function");
+var CallSitePositionKey = NEW_PRIVATE("CallSite#position");
+var CallSiteStrictModeKey = NEW_PRIVATE("CallSite#strict_mode");
 
 function CallSite(receiver, fun, pos, strict_mode) {
   SET_PRIVATE(this, CallSiteReceiverKey, receiver);
   SET_PRIVATE(this, CallSiteFunctionKey, fun);
   SET_PRIVATE(this, CallSitePositionKey, pos);
   SET_PRIVATE(this, CallSiteStrictModeKey, strict_mode);
 }
 
 function CallSiteGetThis() {
   return GET_PRIVATE(this, CallSiteStrictModeKey)
@@ skipping 296 matching lines @@
         %_CallFunction(receiver, NoSideEffectsObjectToString);
   }
   var constructorName = constructor.name;
   if (!constructorName) {
     return requireConstructor ? null :
         %_CallFunction(receiver, NoSideEffectsObjectToString);
   }
   return constructorName;
 }
 
-var formatted_stack_trace_symbol = NEW_PRIVATE_OWN("formatted stack trace");
+var formatted_stack_trace_symbol = NEW_PRIVATE("formatted stack trace");
 
 
 // Format the stack trace if not yet done, and return it.
 // Cache the formatted stack trace on the holder.
 var StackTraceGetter = function() {
   var formatted_stack_trace = UNDEFINED;
   var holder = this;
   while (holder) {
     var formatted_stack_trace =
       GET_PRIVATE(holder, formatted_stack_trace_symbol);
@@ skipping 206 matching lines @@
   // Define accessors first, as this may fail and throw.
   ObjectDefineProperty(obj, 'stack', { get: StackTraceGetter,
                                        set: StackTraceSetter,
                                        configurable: true });
   %CollectStackTrace(obj, cons_opt ? cons_opt : captureStackTrace);
 };
 
 GlobalError.captureStackTrace = captureStackTrace;
 
 });