Standardize usage of virtual/override/final specifiers.

ui/wm/core/transient_window_stacking_client_unittest.cc

Index: ui/wm/core/transient_window_stacking_client_unittest.cc
diff --git a/ui/wm/core/transient_window_stacking_client_unittest.cc b/ui/wm/core/transient_window_stacking_client_unittest.cc
index c06749653ab5243522a71b3b767b754a1583d6a1..23a99e724bc05c6006cd08aad8efc05cc2d13578 100644
--- a/ui/wm/core/transient_window_stacking_client_unittest.cc
+++ b/ui/wm/core/transient_window_stacking_client_unittest.cc
@@ -19,15 +19,15 @@ namespace wm {
 class TransientWindowStackingClientTest : public aura::test::AuraTestBase {
  public:
   TransientWindowStackingClientTest() {}
-  virtual ~TransientWindowStackingClientTest() {}
+  ~TransientWindowStackingClientTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     AuraTestBase::SetUp();
     client_.reset(new TransientWindowStackingClient);
     aura::client::SetWindowStackingClient(client_.get());
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     aura::client::SetWindowStackingClient(NULL);
     AuraTestBase::TearDown();
   }