chrome: Cleanup class/struct forward declarations

chrome/browser/ui/views/apps/app_window_desktop_native_widget_aura_win.h

 // Copyright 2014 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_APPS_APP_WINDOW_DESKTOP_NATIVE_WIDGET_AURA_WIN_H_
 #define CHROME_BROWSER_UI_VIEWS_APPS_APP_WINDOW_DESKTOP_NATIVE_WIDGET_AURA_WIN_H_
 
 #include "base/macros.h"
 #include "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
 
-class BrowserFrame;
-class BrowserView;
 class ChromeNativeAppWindowViewsWin;
 
 namespace views {
 class DesktopWindowTreeHost;
 }
 
-namespace wm {
-class VisibilityController;
-}
-
 // AppWindowDesktopNativeWidgetAura is a DesktopNativeWidgetAura subclass that
 // handles creating the right type of tree hosts for app windows on Windows.
 class AppWindowDesktopNativeWidgetAuraWin
     : public views::DesktopNativeWidgetAura {
  public:
   explicit AppWindowDesktopNativeWidgetAuraWin(
       ChromeNativeAppWindowViewsWin* app_window);
 
  protected:
   ~AppWindowDesktopNativeWidgetAuraWin() override;
 
   // Overridden from views::DesktopNativeWidgetAura:
   void InitNativeWidget(const views::Widget::InitParams& params) override;
   void Maximize() override;
   void Minimize() override;
 
  private:
   // Ownership managed by the views system.
   ChromeNativeAppWindowViewsWin* app_window_;
 
   // Owned by superclass DesktopNativeWidgetAura.
   views::DesktopWindowTreeHost* tree_host_;
 
   DISALLOW_COPY_AND_ASSIGN(AppWindowDesktopNativeWidgetAuraWin);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_APPS_APP_WINDOW_DESKTOP_NATIVE_WIDGET_AURA_WIN_H_