Standardize usage of virtual/override/final specifiers.

ui/wm/core/transient_window_controller.h

Index: ui/wm/core/transient_window_controller.h
diff --git a/ui/wm/core/transient_window_controller.h b/ui/wm/core/transient_window_controller.h
index 4322b414e2fffc8838b1c19f0cde18132b274fda..0dcf98981785873e036af1afd52a99a8aa4cd2cd 100644
--- a/ui/wm/core/transient_window_controller.h
+++ b/ui/wm/core/transient_window_controller.h
@@ -16,16 +16,13 @@ class WM_EXPORT TransientWindowController
     : public aura::client::TransientWindowClient {
  public:
   TransientWindowController();
-  virtual ~TransientWindowController();
+  ~TransientWindowController() override;
 
   // TransientWindowClient:
-  virtual void AddTransientChild(aura::Window* parent,
-                                 aura::Window* child) override;
-  virtual void RemoveTransientChild(aura::Window* parent,
-                                    aura::Window* child) override;
-  virtual aura::Window* GetTransientParent(aura::Window* window) override;
-  virtual const aura::Window* GetTransientParent(
-      const aura::Window* window) override;
+  void AddTransientChild(aura::Window* parent, aura::Window* child) override;
+  void RemoveTransientChild(aura::Window* parent, aura::Window* child) override;
+  aura::Window* GetTransientParent(aura::Window* window) override;
+  const aura::Window* GetTransientParent(const aura::Window* window) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TransientWindowController);