Standardize usage of virtual/override/final specifiers.

ash/display/screen_position_controller_unittest.cc

Index: ash/display/screen_position_controller_unittest.cc
diff --git a/ash/display/screen_position_controller_unittest.cc b/ash/display/screen_position_controller_unittest.cc
index 676adecd6f50a96767252bf80e8ccfa2e2f03e23..f74f86ac3f65975066ece93b4900491c6b074ee6 100644
--- a/ash/display/screen_position_controller_unittest.cc
+++ b/ash/display/screen_position_controller_unittest.cc
@@ -49,9 +49,9 @@ ScreenPositionController* GetScreenPositionController() {
 class ScreenPositionControllerTest : public test::AshTestBase {
  public:
   ScreenPositionControllerTest() {}
-  virtual ~ScreenPositionControllerTest() {}
+  ~ScreenPositionControllerTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     AshTestBase::SetUp();
     window_.reset(new aura::Window(&window_delegate_));
     window_->SetType(ui::wm::WINDOW_TYPE_NORMAL);
@@ -60,7 +60,7 @@ class ScreenPositionControllerTest : public test::AshTestBase {
     window_->set_id(1);
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     window_.reset();
     AshTestBase::TearDown();
   }