Remove GetDefaultReceiver, pass in undefined to sloppy-mode functions instead.

src/collection.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.
 
 (function() {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 191 matching lines @@
 
 
 function SetForEach(f, receiver) {
   if (!IS_SET(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'Set.prototype.forEach', this);
   }
 
   if (!IS_SPEC_FUNCTION(f)) throw MakeTypeError(kCalledNonCallable, f);
   var needs_wrapper = false;
-  if (IS_NULL_OR_UNDEFINED(receiver)) {
-    receiver = %GetDefaultReceiver(f) || receiver;
-  } else {
+  if (IS_NULL(receiver)) {
+    if (%IsSloppyModeFunction(f)) receiver = UNDEFINED;
+  } else if (!IS_UNDEFINED(receiver)) {
     needs_wrapper = SHOULD_CREATE_WRAPPER(f, receiver);
   }
 
   var iterator = new SetIterator(this, ITERATOR_KIND_VALUES);
   var key;
   var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
   var value_array = [UNDEFINED];
   while (%SetIteratorNext(iterator, value_array)) {
     if (stepping) %DebugPrepareStepInIfStepping(f);
     key = value_array[0];
@@ skipping 167 matching lines @@
 
 
 function MapForEach(f, receiver) {
   if (!IS_MAP(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'Map.prototype.forEach', this);
   }
 
   if (!IS_SPEC_FUNCTION(f)) throw MakeTypeError(kCalledNonCallable, f);
   var needs_wrapper = false;
-  if (IS_NULL_OR_UNDEFINED(receiver)) {
-    receiver = %GetDefaultReceiver(f) || receiver;
-  } else {
+  if (IS_NULL(receiver)) {
+    if (%IsSloppyModeFunction(f)) receiver = UNDEFINED;
+  } else if (!IS_UNDEFINED(receiver)) {
     needs_wrapper = SHOULD_CREATE_WRAPPER(f, receiver);
   }
 
   var iterator = new MapIterator(this, ITERATOR_KIND_ENTRIES);
   var stepping = DEBUG_IS_ACTIVE && %DebugCallbackSupportsStepping(f);
   var value_array = [UNDEFINED, UNDEFINED];
   while (%MapIteratorNext(iterator, value_array)) {
     if (stepping) %DebugPrepareStepInIfStepping(f);
     var new_receiver = needs_wrapper ? ToObject(receiver) : receiver;
     %_CallFunction(new_receiver, value_array[1], value_array[0], this, f);
@@ skipping 16 matching lines @@
 InstallFunctions(GlobalMap.prototype, DONT_ENUM, [
   "get", MapGet,
   "set", MapSet,
   "has", MapHas,
   "delete", MapDelete,
   "clear", MapClearJS,
   "forEach", MapForEach
 ]);
 
 })();