Clean up native context slots and add new ones.

src/json-stringifier.h

 // 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.
 
 #ifndef V8_JSON_STRINGIFIER_H_
 #define V8_JSON_STRINGIFIER_H_
 
 #include "src/conversions.h"
 #include "src/messages.h"
 #include "src/string-builder.h"
@@ skipping 340 matching lines @@
 
   return SerializeGeneric(object, key, comma, deferred_string_key);
 }
 
 
 BasicJsonStringifier::Result BasicJsonStringifier::SerializeGeneric(
     Handle<Object> object,
     Handle<Object> key,
     bool deferred_comma,
     bool deferred_key) {
-  Handle<JSObject> builtins(isolate_->native_context()->builtins(), isolate_);
-  Handle<JSFunction> builtin = Handle<JSFunction>::cast(
-      Object::GetProperty(isolate_, builtins, "$jsonSerializeAdapter")
-          .ToHandleChecked());
-
+  Handle<JSFunction> fun = isolate_->json_serialize_adapter();
   Handle<Object> argv[] = { key, object };
   Handle<Object> result;
   ASSIGN_RETURN_ON_EXCEPTION_VALUE(
-      isolate_, result,
-      Execution::Call(isolate_, builtin, object, 2, argv),
+      isolate_, result, Execution::Call(isolate_, fun, object, 2, argv),
       EXCEPTION);
   if (result->IsUndefined()) return UNCHANGED;
   if (deferred_key) {
     if (key->IsSmi()) key = factory()->NumberToString(key);
     SerializeDeferredKey(deferred_comma, key);
   }
 
   builder_.AppendString(Handle<String>::cast(result));
   return SUCCESS;
 }
@@ skipping 294 matching lines @@
       SerializeString_<uint8_t, uc16>(object);
     } else {
       SerializeString_<uc16, uc16>(object);
     }
   }
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSON_STRINGIFIER_H_