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

test/mjsunit/regress/regress-124.js

Index: test/mjsunit/regress/regress-124.js
diff --git a/test/mjsunit/regress/regress-124.js b/test/mjsunit/regress/regress-124.js
index e0df6f54a4742837a686b989b360afd63b230a1f..0b3aae5358605c14156e20d4feee581d66d39fcd 100644
--- a/test/mjsunit/regress/regress-124.js
+++ b/test/mjsunit/regress/regress-124.js
@@ -26,13 +26,13 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 assertEquals("[object global]", this.toString());
-assertEquals("[object Undefined]", toString());
+assertEquals("[object global]", toString());
 
 assertEquals("[object global]", eval("this.toString()"));
-assertEquals("[object Undefined]", eval("toString()"));
+assertEquals("[object global]", eval("toString()"));
 
 assertEquals("[object global]", eval("var f; this.toString()"));
-assertEquals("[object Undefined]", eval("var f; toString()"));
+assertEquals("[object global]", eval("var f; toString()"));
 
 
 function F(f) {
@@ -45,7 +45,7 @@ function F(f) {
   assertEquals("[object global]", eval("var f; this.toString()"));
   assertEquals("[object global]", eval("var f; toString()"));
 
-  assertEquals("[object Undefined]", eval("f()"));
+  assertEquals("[object global]", eval("f()"));
 
   // Receiver should be the arguments object here.
   assertEquals("[object Arguments]", eval("arguments[0]()"));