Revert of Reland: Initialize and reset V4LocalDBManager. Instantiate V4Stores.

components/safe_browsing_db/v4_store.cc

-// Copyright 2016 The Chromium 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 "components/safe_browsing_db/v4_store.h"
-
-namespace safe_browsing {
-
-V4Store::V4Store(const scoped_refptr<base::SequencedTaskRunner>& task_runner,
-                 const base::FilePath& store_path) {}
-
-V4Store::~V4Store() {}
-
-bool V4Store::Reset() {
-  // TODO(vakh): Implement skeleton.
-  return true;
-}
-
-}  // namespace safe_browsing