Revert of Introduce AndroidFocusRules and NativeWidgetAndroid

ui/views/widget/native_widget_aura.h

Index: ui/views/widget/native_widget_aura.h
diff --git a/ui/views/widget/native_widget_aura.h b/ui/views/widget/native_widget_aura.h
index 30bf169c784be5e42f9f7cb6dd78b4810e5bd0ae..56cc826132e89bc626a302dc31c55127e90ca7ae 100644
--- a/ui/views/widget/native_widget_aura.h
+++ b/ui/views/widget/native_widget_aura.h
@@ -42,8 +42,8 @@ class VIEWS_EXPORT NativeWidgetAura
  public:
   explicit NativeWidgetAura(internal::NativeWidgetDelegate* delegate);
 
-  // Called internally by NativeWidget implementations to associate
-  // |native_widget| with |window|.
+  // Called internally by NativeWidgetAura and DesktopNativeWidgetAura to
+  // associate |native_widget| with |window|.
   static void RegisterNativeWidgetForWindow(
       internal::NativeWidgetPrivate* native_widget,
       aura::Window* window);