Componentize HistoryDatabase

components/history/content/browser/history_database_helper.h

+// Copyright 2015 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_HISTORY_CONTENT_BROWSER_HISTORY_DATABASE_HELPER_H_
+#define COMPONENTS_HISTORY_CONTENT_BROWSER_HISTORY_DATABASE_HELPER_H_
+
+namespace base {
+class FilePath;
+}
+
+namespace history {
+
+struct HistoryDatabaseParams;
+
+// Returns a HistoryDatabaseParams for |history_dir|.
+HistoryDatabaseParams HistoryDatabaseParamsForPath(
+    const base::FilePath& history_dir);
+
+}  // namespace history
+
+#endif  // COMPONENTS_HISTORY_CONTENT_BROWSER_HISTORY_DATABASE_HELPER_H_