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

sql/sqlite_features_unittest.cc

Index: sql/sqlite_features_unittest.cc
diff --git a/sql/sqlite_features_unittest.cc b/sql/sqlite_features_unittest.cc
index e721693383fbe0d73abfcb846de5e47767bbeed5..d9bcb86bc61d61394369506f7d5efeadb89c6c76 100644
--- a/sql/sqlite_features_unittest.cc
+++ b/sql/sqlite_features_unittest.cc
@@ -27,7 +27,7 @@ class SQLiteFeaturesTest : public testing::Test {
  public:
   SQLiteFeaturesTest() : error_(SQLITE_OK) {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     ASSERT_TRUE(db_.Open(temp_dir_.path().AppendASCII("SQLStatementTest.db")));
 
@@ -37,7 +37,7 @@ class SQLiteFeaturesTest : public testing::Test {
                                       &error_, &sql_text_));
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     // If any error happened the original sql statement can be found in
     // |sql_text_|.
     EXPECT_EQ(SQLITE_OK, error_);