Standardize usage of virtual/override/final specifiers in dbus/.

dbus/object_proxy_unittest.cc

Index: dbus/object_proxy_unittest.cc
diff --git a/dbus/object_proxy_unittest.cc b/dbus/object_proxy_unittest.cc
index 246058ddd5d283b940102664cc85dbf13afc8696..22130b64bc343352eedd633872d545dd44c01489 100644
--- a/dbus/object_proxy_unittest.cc
+++ b/dbus/object_proxy_unittest.cc
@@ -15,7 +15,7 @@ namespace {
 
 class ObjectProxyTest : public testing::Test {
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     Bus::Options bus_options;
     bus_options.bus_type = Bus::SESSION;
     bus_options.connection_type = Bus::PRIVATE;
@@ -25,9 +25,7 @@ class ObjectProxyTest : public testing::Test {
         "org.chromium.TestService", ObjectPath("/org/chromium/TestObject"));
   }
 
-  virtual void TearDown() override {
-    bus_->ShutdownAndBlock();
-  }
+  void TearDown() override { bus_->ShutdownAndBlock(); }
 
   base::MessageLoopForIO message_loop_;
   scoped_refptr<Bus> bus_;