Revert of Converts chrome to aura-mus

chrome/browser/ui/views/frame/browser_frame_mus.h

 // Copyright 2015 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 CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_MUS_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_MUS_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/views/frame/native_browser_frame.h"
-#include "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
+#include "ui/views/mus/native_widget_mus.h"
 
-class BrowserFrame;
 class BrowserView;
 
 class BrowserFrameMus : public NativeBrowserFrame,
-                        public views::DesktopNativeWidgetAura {
+                        public views::NativeWidgetMus {
  public:
   BrowserFrameMus(BrowserFrame* browser_frame, BrowserView* browser_view);
   ~BrowserFrameMus() override;
 
+  ui::Window* mus_window();
+
  private:
   // Overridden from NativeBrowserFrame:
   views::Widget::InitParams GetWidgetParams() override;
   bool UseCustomFrame() const override;
   bool UsesNativeSystemMenu() const override;
   bool ShouldSaveWindowPlacement() const override;
   void GetWindowPlacement(gfx::Rect* bounds,
                           ui::WindowShowState* show_state) const override;
   bool PreHandleKeyboardEvent(
       const content::NativeWebKeyboardEvent& event) override;
   bool HandleKeyboardEvent(
       const content::NativeWebKeyboardEvent& event) override;
   int GetMinimizeButtonOffset() const override;
 
-  BrowserFrame* browser_frame_;
+  // Overriden from NativeWidgetMus:
+  void UpdateClientArea() override;
+
   BrowserView* browser_view_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserFrameMus);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_MUS_H_