Revert of Introduce AndroidFocusRules and NativeWidgetAndroid

ui/views/widget/native_widget_aura.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/aura/client/focus_change_observer.h"
@@ skipping 24 matching lines @@
     : public internal::NativeWidgetPrivate,
       public aura::WindowDelegate,
       public aura::WindowObserver,
       public aura::client::ActivationDelegate,
       public aura::client::ActivationChangeObserver,
       public aura::client::FocusChangeObserver,
       public aura::client::DragDropDelegate {
  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);
 
   // Overridden from internal::NativeWidgetPrivate:
   void InitNativeWidget(const Widget::InitParams& params) override;
   void OnWidgetInitDone() override;
   NonClientFrameView* CreateNonClientFrameView() override;
   bool ShouldUseNativeFrame() const override;
   bool ShouldWindowContentsBeTransparent() const override;
@@ skipping 169 matching lines @@
   // The following factory is used for calls to close the NativeWidgetAura
   // instance.
   base::WeakPtrFactory<NativeWidgetAura> close_widget_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_