Standardize usage of virtual/override/final specifiers.

ash/wm/default_state.h

Index: ash/wm/default_state.h
diff --git a/ash/wm/default_state.h b/ash/wm/default_state.h
index a09f0a5e42f7e41f245328f19076277460de8710..f03adb8cd380534230aa4a416c5e3b18d7bafc64 100644
--- a/ash/wm/default_state.h
+++ b/ash/wm/default_state.h
@@ -16,15 +16,14 @@ class SetBoundsEvent;
 class DefaultState : public WindowState::State {
  public:
   explicit DefaultState(WindowStateType initial_state_type);
-  virtual ~DefaultState();
+  ~DefaultState() override;
 
   // WindowState::State overrides:
-  virtual void OnWMEvent(WindowState* window_state,
-                         const WMEvent* event) override;
-  virtual WindowStateType GetType() const override;
-  virtual void AttachState(WindowState* window_state,
-                           WindowState::State* previous_state) override;
-  virtual void DetachState(WindowState* window_state) override;
+  void OnWMEvent(WindowState* window_state, const WMEvent* event) override;
+  WindowStateType GetType() const override;
+  void AttachState(WindowState* window_state,
+                   WindowState::State* previous_state) override;
+  void DetachState(WindowState* window_state) override;
 
  private:
   // Process state dependent events, such as TOGGLE_MAXIMIZED,