The runtime function DeclareGlobals is not called from JavaScript....

test/mjsunit/fuzz-natives.js

 // Copyright 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 109 matching lines @@
   "NewArgumentsFast": true,
   "PushContext": true,
   "LazyCompile": true,
   "CreateObjectLiteralBoilerplate": true,
   "CloneLiteralBoilerplate": true,
   "CloneShallowLiteralBoilerplate": true,
   "CreateArrayLiteralBoilerplate": true,
   "IS_VAR": true,
   "ResolvePossiblyDirectEval": true,
   "Log": true,
+  "DeclareGlobals": true,
 
   "CollectStackTrace": true
 };
 
 var currentlyUncallable = {
   // We need to find a way to test this without breaking the system.
   "SystemBreak": true
 };
 
 function testNatives() {
   var allNatives = %ListNatives();
   for (var i = 0; i < allNatives.length; i++) {
     var nativeInfo = allNatives[i];
     var name = nativeInfo[0];
     if (name in knownProblems || name in currentlyUncallable)
       continue;
     print(name);
     var argc = nativeInfo[1];
     testArgumentCount(name);
     testArgumentTypes(name, argc);
   }
 }
 
 testNatives();