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

chromeos/dbus/nfc_client_unittest.cc

Index: chromeos/dbus/nfc_client_unittest.cc
diff --git a/chromeos/dbus/nfc_client_unittest.cc b/chromeos/dbus/nfc_client_unittest.cc
index 7870e482d39c1b740821045d516626790d30b356..736853bea4efdbd506e4718016267333bfdc097f 100644
--- a/chromeos/dbus/nfc_client_unittest.cc
+++ b/chromeos/dbus/nfc_client_unittest.cc
@@ -88,9 +88,9 @@ class MockNfcTagObserver : public NfcTagClient::Observer {
 class NfcClientTest : public testing::Test {
  public:
   NfcClientTest() : response_(NULL) {}
-  virtual ~NfcClientTest() {}
+  ~NfcClientTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     // Create the mock bus.
     dbus::Bus::Options options;
     options.bus_type = dbus::Bus::SYSTEM;
@@ -222,7 +222,7 @@ class NfcClientTest : public testing::Test {
     message_loop_.RunUntilIdle();
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     tag_client_->RemoveObserver(&mock_tag_observer_);
     device_client_->RemoveObserver(&mock_device_observer_);
     adapter_client_->RemoveObserver(&mock_adapter_observer_);