Standardize usage of virtual/override/final specifiers.

ui/wm/core/shadow_controller_unittest.cc

Index: ui/wm/core/shadow_controller_unittest.cc
diff --git a/ui/wm/core/shadow_controller_unittest.cc b/ui/wm/core/shadow_controller_unittest.cc
index 1b1aa189603e78db1a781dabec14be0ba3d31764..18116d42576d66fceb2e7ef4e18497d275eec992 100644
--- a/ui/wm/core/shadow_controller_unittest.cc
+++ b/ui/wm/core/shadow_controller_unittest.cc
@@ -25,9 +25,9 @@ namespace wm {
 class ShadowControllerTest : public aura::test::AuraTestBase {
  public:
   ShadowControllerTest() {}
-  virtual ~ShadowControllerTest() {}
+  ~ShadowControllerTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     wm_state_.reset(new wm::WMState);
     AuraTestBase::SetUp();
     new wm::DefaultActivationClient(root_window());
@@ -35,7 +35,7 @@ class ShadowControllerTest : public aura::test::AuraTestBase {
         aura::client::GetActivationClient(root_window());
     shadow_controller_.reset(new ShadowController(activation_client));
   }
-  virtual void TearDown() override {
+  void TearDown() override {
     shadow_controller_.reset();
     AuraTestBase::TearDown();
     wm_state_.reset();