Revert "Pass undefined to JS builtins when called with implicit receiver."

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 177ac744f78deb2c7ff42b46d27e236eafc6eedf..8d2dfd5b3937efae843383e73e5651784f6f2e4f 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -128,11 +128,11 @@ bool LCodeGen::GeneratePrologue() {
   }
 #endif
 
-  // Strict mode functions and builtins need to replace the receiver
-  // with undefined when called as functions (without an explicit
-  // receiver object). ecx is zero for method calls and non-zero for
-  // function calls.
-  if (info_->is_strict_mode() || info_->is_native()) {
+  // Strict mode functions need to replace the receiver with undefined
+  // when called as functions (without an explicit receiver
+  // object). ecx is zero for method calls and non-zero for function
+  // calls.
+  if (info_->is_strict_mode()) {
     Label ok;
     __ test(ecx, Operand(ecx));
     __ j(zero, &ok, Label::kNear);