Remove empty string-search.cc file.

src/string-search.cc

-// Copyright 2010 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.
-
-#include "src/v8.h"
-
-#include "src/string-search.h"
-
-namespace v8 {
-namespace internal {
-
-// Storage for constants used by string-search.
-
-// Now in Isolate:
-// bad_char_shift_table()
-// good_suffix_shift_table()
-// suffix_table()
-
-}  // namespace internal
-}  // namespace v8