Make ProtoDatabase properly handle failed Init

components/leveldb_proto/leveldb_database.h

 // Copyright 2014 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_LEVELDB_PROTO_LEVELDB_DATABASE_H_
 #define COMPONENTS_LEVELDB_PROTO_LEVELDB_DATABASE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_split.h"
 #include "base/threading/thread_collision_warner.h"
 
 namespace leveldb {
 class DB;
+struct Options;
 }  // namespace leveldb
 
 namespace leveldb_proto {
 
 // Interacts with the LevelDB third party module.
 // Once constructed, function calls and destruction should all occur on the
 // same thread (not necessarily the same as the constructor).
 class LevelDB {
  public:
   LevelDB();
   virtual ~LevelDB();
 
+  virtual bool InitWithOptions(const base::FilePath& database_dir,
+                               const leveldb::Options& options);
   virtual bool Init(const base::FilePath& database_dir);
   virtual bool Save(const base::StringPairs& pairs_to_save,
                     const std::vector<std::string>& keys_to_remove);
   virtual bool Load(std::vector<std::string>* entries);
 
  private:
   DFAKE_MUTEX(thread_checker_);
   scoped_ptr<leveldb::DB> db_;
 };
 
 }  // namespace leveldb_proto
 
 #endif  // COMPONENTS_LEVELDB_PROTO_LEVELDB_DATABASE_H_