Get rid of MetaTableHelper class and make use of the app/sql API in the LoginDatabase.

chrome/browser/meta_table_helper.h

-// Copyright (c) 2006-2008 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 CHROME_BROWSER_META_TABLE_HELPER_H__
-#define CHROME_BROWSER_META_TABLE_HELPER_H__
-
-#include <string>
-
-#include "base/basictypes.h"
-
-struct sqlite3;
-class SQLStatement;
-
-// MetaTableHelper maintains arbitrary key/value pairs in a table, as well
-// as version information. MetaTableHelper is used by both WebDatabase and
-// HistoryDatabase to maintain version information.
-//
-// To use a MetalTableHelper you must invoke the init method specifying the
-// database to use.
-class MetaTableHelper {
- public:
-  // Creates a new MetaTableHelper. After construction you must invoke
-  // Init with the appropriate database.
-  MetaTableHelper();
-  ~MetaTableHelper();
-
-  // Initializes the MetaTableHelper, creating the meta table if necessary. For
-  // new tables, it will initialize the version number to |version| and the
-  // compatible version number to |compatible_version|.
-  //
-  // The name of the database in the sqlite connection (for tables named with
-  // the "db_name.table_name" scheme is given in |db_name|. If empty, it is
-  // assumed there is no database name.
-  bool Init(const std::string& db_name,
-            int version,
-            int compatible_version,
-            sqlite3* db);
-
-  // Version number. This should be the version number of the creator of the
-  // file. GetVersionNumber will return 0 if there is no version number.
-  // See also *CompatibleVersionNumber.
-  void SetVersionNumber(int version);
-  int GetVersionNumber();
-
-  // The compatible version number is the lowest version that this file format
-  // is readable by. If an addition or other non-critical change is made to the
-  // file in such a way that it could be read or written non-catastrophically
-  // by an older version, this number tells us which version that is.
-  //
-  // Any version newer than this should be able to interpret the file. Any
-  // version older than this should not touch the file or else it might
-  // corrupt it.
-  //
-  // GetCompatibleVersionNumber will return 0 if there is none.
-  void SetCompatibleVersionNumber(int version);
-  int GetCompatibleVersionNumber();
-
-  // Arbitrary key/value pair with a wstring value.
-  bool SetValue(const std::string& key, const std::wstring& value);
-  bool GetValue(const std::string& key, std::wstring* value);
-
-  // Arbitrary key/value pair with an int value.
-  bool SetValue(const std::string& key, int value);
-  bool GetValue(const std::string& key, int* value);
-
-  // Arbitrary key/value pair with an int64 value.
-  bool SetValue(const std::string& key, int64 value);
-  bool GetValue(const std::string& key, int64* value);
-
- private:
-  friend class MetaTableHelperTest;
-
-  // Appends the meta table name to the SQL statement.
-  static void appendMetaTableName(const std::string& db_name, std::string* sql);
-
-  // Conveniences to prepare the two types of statements used by
-  // MetaTableHelper.
-  bool PrepareSetStatement(SQLStatement* statement, const std::string& key);
-  bool PrepareGetStatement(SQLStatement* statement, const std::string& key);
-
-  sqlite3* db_;
-
-  // Name of the database within the connection, if there is one. When empty,
-  // there is no special database name.
-  std::string db_name_;
-
-  DISALLOW_EVIL_CONSTRUCTORS(MetaTableHelper);
-};
-
-#endif  // CHROME_BROWSER_META_TABLE_HELPER_H__