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

chromeos/cryptohome/homedir_methods_unittest.cc

Index: chromeos/cryptohome/homedir_methods_unittest.cc
diff --git a/chromeos/cryptohome/homedir_methods_unittest.cc b/chromeos/cryptohome/homedir_methods_unittest.cc
index 3ed975333107ad6b4ea391ff49e8c2b13afe662a..9edd7b0227ca7e04f99ce1f1a11284e183b650ea 100644
--- a/chromeos/cryptohome/homedir_methods_unittest.cc
+++ b/chromeos/cryptohome/homedir_methods_unittest.cc
@@ -46,11 +46,11 @@ const char kProviderData2Bytes[] = "data_2 bytes";
 class HomedirMethodsTest : public testing::Test {
  public:
   HomedirMethodsTest();
-  virtual ~HomedirMethodsTest();
+  ~HomedirMethodsTest() override;
 
   // testing::Test:
-  virtual void SetUp() override;
-  virtual void TearDown() override;
+  void SetUp() override;
+  void TearDown() override;
 
   void RunProtobufMethodCallback(
       const chromeos::CryptohomeClient::ProtobufMethodCallback& callback);