--- a/src/3rdparty/webkit/JavaScriptCore/runtime/JSGlobalObject.cpp	Wed Jun 23 19:07:03 2010 +0300
+++ b/src/3rdparty/webkit/JavaScriptCore/runtime/JSGlobalObject.cpp	Tue Jul 06 15:10:48 2010 +0300
@@ -128,6 +128,8 @@
 {
     ASSERT(JSLock::currentThreadIsHoldingLock());
 
+    structure()->disableSpecificFunctionTracking();
+
     d()->globalData = Heap::heap(this)->globalData();
     d()->globalScopeChain = ScopeChain(this, d()->globalData.get(), this, thisValue);
 
@@ -317,9 +319,9 @@
     // Set global values.
     GlobalPropertyInfo staticGlobals[] = {
         GlobalPropertyInfo(Identifier(exec, "Math"), new (exec) MathObject(exec, MathObject::createStructure(d()->objectPrototype)), DontEnum | DontDelete),
-        GlobalPropertyInfo(Identifier(exec, "NaN"), jsNaN(exec), DontEnum | DontDelete),
-        GlobalPropertyInfo(Identifier(exec, "Infinity"), jsNumber(exec, Inf), DontEnum | DontDelete),
-        GlobalPropertyInfo(Identifier(exec, "undefined"), jsUndefined(), DontEnum | DontDelete),
+        GlobalPropertyInfo(Identifier(exec, "NaN"), jsNaN(exec), DontEnum | DontDelete | ReadOnly),
+        GlobalPropertyInfo(Identifier(exec, "Infinity"), jsNumber(exec, Inf), DontEnum | DontDelete | ReadOnly),
+        GlobalPropertyInfo(Identifier(exec, "undefined"), jsUndefined(), DontEnum | DontDelete | ReadOnly),
         GlobalPropertyInfo(Identifier(exec, "JSON"), new (exec) JSONObject(JSONObject::createStructure(d()->objectPrototype)), DontEnum | DontDelete)
     };