Revert of Implement Fast Accessor Builder

src/api-experimental.h

-// Copyright 2015 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_API_EXPERIMENTAL_H_
-#define V8_API_EXPERIMENTAL_H_
-
-#include "src/handles.h"
-
-namespace v8 {
-namespace internal {
-class Code;
-}  // internal;
-namespace experimental {
-class FastAccessorBuilder;
-}  // experimental
-
-namespace internal {
-namespace experimental {
-
-v8::internal::MaybeHandle<v8::internal::Code> BuildCodeFromFastAccessorBuilder(
-    v8::experimental::FastAccessorBuilder* fast_handler);
-
-}  // namespace experimental
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_API_EXPERIMENTAL_H_