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

chromeos/cryptohome/system_salt_getter_unittest.cc

Index: chromeos/cryptohome/system_salt_getter_unittest.cc
diff --git a/chromeos/cryptohome/system_salt_getter_unittest.cc b/chromeos/cryptohome/system_salt_getter_unittest.cc
index f60bc7ff1241ed04466907616a9dd094feaf6fc7..43e1690cd5c02c566bbf780fd44e19a629483c81 100644
--- a/chromeos/cryptohome/system_salt_getter_unittest.cc
+++ b/chromeos/cryptohome/system_salt_getter_unittest.cc
@@ -24,7 +24,7 @@ class SystemSaltGetterTest : public testing::Test {
  protected:
   SystemSaltGetterTest() : fake_cryptohome_client_(NULL) {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     fake_cryptohome_client_ = new FakeCryptohomeClient;
     DBusThreadManager::GetSetterForTesting()->SetCryptohomeClient(
         scoped_ptr<CryptohomeClient>(fake_cryptohome_client_));
@@ -35,7 +35,7 @@ class SystemSaltGetterTest : public testing::Test {
     ASSERT_TRUE(SystemSaltGetter::Get());
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     SystemSaltGetter::Shutdown();
     DBusThreadManager::Shutdown();
   }