Standardize usage of virtual/override/final specifiers.

extensions/browser/value_store/leveldb_value_store_unittest.cc

Index: extensions/browser/value_store/leveldb_value_store_unittest.cc
diff --git a/extensions/browser/value_store/leveldb_value_store_unittest.cc b/extensions/browser/value_store/leveldb_value_store_unittest.cc
index a81f88760c82bc1605fca5d092e4c6dbc3bbda9f..3c0fd534bc95cecfbdedee792d2ef17f39217cf8 100644
--- a/extensions/browser/value_store/leveldb_value_store_unittest.cc
+++ b/extensions/browser/value_store/leveldb_value_store_unittest.cc
@@ -32,16 +32,16 @@ INSTANTIATE_TEST_CASE_P(
 class LeveldbValueStoreUnitTest : public testing::Test {
  public:
   LeveldbValueStoreUnitTest() {}
-  virtual ~LeveldbValueStoreUnitTest() {}
+  ~LeveldbValueStoreUnitTest() override {}
 
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     ASSERT_TRUE(database_dir_.CreateUniqueTempDir());
     OpenStore();
     ASSERT_FALSE(store_->Get()->HasError());
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     store_->Clear();
     store_.reset();
   }