Initialize and reset V4LocalDBManager. Instantiate V4Stores.

components/safe_browsing_db/v4_store.h

 // 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.
 
 #ifndef COMPONENTS_SAFE_BROWSING_DB_V4_STORE_H_
 #define COMPONENTS_SAFE_BROWSING_DB_V4_STORE_H_
 
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/sequenced_task_runner.h"
+
 namespace safe_browsing {
 
 class V4Store {
+ public:
+  // The |task_runner| is used to ensure that the operations in this file are
+  // performed on the correct thread. |store_path| specifies the location on
+  // disk for this file.
+  V4Store(const scoped_refptr<base::SequencedTaskRunner>& task_runner,
+          const base::FilePath& store_path);
+  virtual ~V4Store();
+
+  // Reset internal state and delete the backing file.
+  virtual bool Reset();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(V4Store);
 };
 
 }  // namespace safe_browsing
 
 #endif  // COMPONENTS_SAFE_BROWSING_DB_V4_STORE_H_