Revert of [builtins] Refactor the remaining Date builtins.

src/js/json.js

Index: src/js/json.js
diff --git a/src/js/json.js b/src/js/json.js
index b8836eaddd919fb9387c962391f4075e7df8e302..ee3b9dceea217062f077131c5807b3716352a6e5 100644
--- a/src/js/json.js
+++ b/src/js/json.js
@@ -11,7 +11,6 @@
 // -------------------------------------------------------------------
 // Imports
 
-var GlobalDate = global.Date;
 var GlobalJSON = global.JSON;
 var GlobalSet = global.Set;
 var InternalArray = utils.InternalArray;
@@ -248,24 +247,6 @@
 ]);
 
 // -------------------------------------------------------------------
-// Date.toJSON
-
-// 20.3.4.37 Date.prototype.toJSON ( key )
-function DateToJSON(key) {
-  var o = TO_OBJECT(this);
-  var tv = TO_PRIMITIVE_NUMBER(o);
-  if (IS_NUMBER(tv) && !NUMBER_IS_FINITE(tv)) {
-    return null;
-  }
-  return o.toISOString();
-}
-
-// Set up non-enumerable functions of the Date prototype object.
-utils.InstallFunctions(GlobalDate.prototype, DONT_ENUM, [
-  "toJSON", DateToJSON
-]);
-
-// -------------------------------------------------------------------
 // JSON Builtins
 
 function JsonSerializeAdapter(key, object) {