Update {virtual,override,final} to follow C++11 style in ash.

ash/virtual_keyboard_controller.h

Index: ash/virtual_keyboard_controller.h
diff --git a/ash/virtual_keyboard_controller.h b/ash/virtual_keyboard_controller.h
index 811a247f06048289515c9c09038350cefeaf3e3d..83b9fcebc8300a75d4b288dc33b0ea67ed6060d3 100644
--- a/ash/virtual_keyboard_controller.h
+++ b/ash/virtual_keyboard_controller.h
@@ -22,12 +22,12 @@ class ASH_EXPORT VirtualKeyboardController
 
   // ShellObserver:
   // TODO(rsadam@): Remove when autovirtual keyboard flag is on by default.
-  virtual void OnMaximizeModeStarted() override;
-  virtual void OnMaximizeModeEnded() override;
+  void OnMaximizeModeStarted() override;
+  void OnMaximizeModeEnded() override;
 
   // ui::InputDeviceObserver:
-  virtual void OnTouchscreenDeviceConfigurationChanged() override;
-  virtual void OnKeyboardDeviceConfigurationChanged() override;
+  void OnTouchscreenDeviceConfigurationChanged() override;
+  void OnKeyboardDeviceConfigurationChanged() override;
 
   // Toggles whether the presense of an external keyboard should be ignored
   // when determining whether or not to show the on-screen keyboard.