Update {virtual,override,final} to follow C++11 style in ash.

ash/sticky_keys/sticky_keys_unittest.cc

Index: ash/sticky_keys/sticky_keys_unittest.cc
diff --git a/ash/sticky_keys/sticky_keys_unittest.cc b/ash/sticky_keys/sticky_keys_unittest.cc
index feb56ad3e70264d00727488ea050ab26c90ee1b8..16bdd20da3c8da0f4ed84e991616e65bad7724d6 100644
--- a/ash/sticky_keys/sticky_keys_unittest.cc
+++ b/ash/sticky_keys/sticky_keys_unittest.cc
@@ -34,7 +34,7 @@ class StickyKeysTest : public test::AshTestBase {
       : target_(NULL),
         root_window_(NULL) {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     test::AshTestBase::SetUp();
 
     // |target_| owned by root window of shell. It is still safe to delete
@@ -45,9 +45,7 @@ class StickyKeysTest : public test::AshTestBase {
     ui::SetUpTouchPadForTest(kTouchPadDeviceId);
   }
 
-  virtual void TearDown() override {
-    test::AshTestBase::TearDown();
-  }
+  void TearDown() override { test::AshTestBase::TearDown(); }
 
   virtual void OnShortcutPressed() {
     if (target_) {