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

chrome/browser/meta_table_helper_unittest.cc

-// Copyright (c) 2009 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.
-
-// Tests for MetaTableHelper.
-
-#include "chrome/browser/meta_table_helper.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-class MetaTableHelperTest : public testing::Test {
- public:
-  static void appendMetaTableName(const std::string& db_name,
-                                  std::string* sql) {
-    MetaTableHelper::appendMetaTableName(db_name, sql);
-  }
-};
-
-TEST_F(MetaTableHelperTest, EmptyDbName) {
-  std::string sql("select * from ");
-  MetaTableHelperTest::appendMetaTableName(std::string(), &sql);
-  EXPECT_EQ("select * from meta", sql);
-}
-
-TEST_F(MetaTableHelperTest, NonEmptyDbName) {
-  std::string sql("select * from ");
-  MetaTableHelperTest::appendMetaTableName(std::string("mydb"), &sql);
-  EXPECT_EQ("select * from mydb.meta", sql);
-}