Use leveldb_env::OpenDB() to open leveldb databases.

content/browser/dom_storage/session_storage_database.h

 // Copyright 2013 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 CONTENT_BROWSER_DOM_STORAGE_SESSION_STORAGE_DATABASE_H_
 #define CONTENT_BROWSER_DOM_STORAGE_SESSION_STORAGE_DATABASE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 84 matching lines @@
   // Opens the database at file_path_ if it exists already and creates it if
   // |create_if_needed| is true. Returns true if the database was opened, false
   // if the opening failed or was not necessary (the database doesn't exist and
   // |create_if_needed| is false). The possible failures are:
   // - leveldb cannot open the database.
   // - The database is in an inconsistent or errored state.
   bool LazyOpen(bool create_if_needed);
 
   // Tries to open the database at file_path_, assigns |db| to point to the
   // opened leveldb::DB instance.
-  leveldb::Status TryToOpen(leveldb::DB** db);
+  leveldb::Status TryToOpen(std::unique_ptr<leveldb::DB>* db);
 
   // Returns true if the database is already open, false otherwise.
   bool IsOpen() const;
 
   // Helpers for checking caller erros, invariants and database errors. All
   // these return |ok|, for chaining.
   bool CallerErrorCheck(bool ok) const;
   bool ConsistencyCheck(bool ok);
   bool DatabaseErrorCheck(bool ok);
 
@@ skipping 101 matching lines @@
   // The number of database operations in progress. We need this so that we can
   // delete an inconsistent database at the right moment.
   int operation_count_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionStorageDatabase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_SESSION_STORAGE_DATABASE_H_