Standardize usage of virtual/override/final specifiers.

extensions/browser/api/storage/storage_frontend_unittest.cc

Index: extensions/browser/api/storage/storage_frontend_unittest.cc
diff --git a/extensions/browser/api/storage/storage_frontend_unittest.cc b/extensions/browser/api/storage/storage_frontend_unittest.cc
index 4f5b65e69d3e5357fbb9c70f46a7bc0dbdd9eba0..b292244d0f012c31af9dfc7146749822dae3956c 100644
--- a/extensions/browser/api/storage/storage_frontend_unittest.cc
+++ b/extensions/browser/api/storage/storage_frontend_unittest.cc
@@ -44,13 +44,13 @@ class ExtensionSettingsFrontendTest : public ExtensionsTest {
         ui_thread_(BrowserThread::UI, base::MessageLoop::current()),
         file_thread_(BrowserThread::FILE, base::MessageLoop::current()) {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     ExtensionsTest::SetUp();
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     ResetFrontend();
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     frontend_.reset();
     // Execute any pending deletion tasks.
     message_loop_.RunUntilIdle();