Standardize usage of virtual/override/final specifiers in sql/.

sql/meta_table_unittest.cc

 // 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.
 
 #include "sql/meta_table.h"
 
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "sql/connection.h"
 #include "sql/statement.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 class SQLMetaTableTest : public testing::Test {
  public:
-  virtual void SetUp() {
+  void SetUp() override {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     ASSERT_TRUE(db_.Open(temp_dir_.path().AppendASCII("SQLMetaTableTest.db")));
   }
 
-  virtual void TearDown() {
-    db_.Close();
-  }
+  void TearDown() override { db_.Close(); }
 
   sql::Connection& db() { return db_; }
 
  private:
   base::ScopedTempDir temp_dir_;
   sql::Connection db_;
 };
 
 TEST_F(SQLMetaTableTest, DoesTableExist) {
   EXPECT_FALSE(sql::MetaTable::DoesTableExist(&db()));
@@ skipping 229 matching lines @@
   EXPECT_TRUE(meta_table.SetValue(kKey, kValue));
   EXPECT_TRUE(meta_table.GetValue(kKey, &value));
   EXPECT_EQ(kValue, value);
 
   // After delete value isn't present.
   EXPECT_TRUE(meta_table.DeleteKey(kKey));
   EXPECT_FALSE(meta_table.GetValue(kKey, &value));
 }
 
 }  // namespace