Widget::ShouldUseNativeFrame is now meaningful on Linux.

chrome/browser/ui/views/frame/browser_desktop_root_window_host_win.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 CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_ROOT_WINDOW_HOST_WIN_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_ROOT_WINDOW_HOST_WIN_H_
 
 #include <windows.h>
 #include <uxtheme.h>
 
@@ skipping 34 matching lines @@
   virtual void HandleCreate() OVERRIDE;
   virtual void HandleFrameChanged() OVERRIDE;
   virtual bool PreHandleMSG(UINT message,
                             WPARAM w_param,
                             LPARAM l_param,
                             LRESULT* result) OVERRIDE;
   virtual void PostHandleMSG(UINT message,
                              WPARAM w_param,
                              LPARAM l_param) OVERRIDE;
   virtual bool IsUsingCustomFrame() const OVERRIDE;
-  virtual bool ShouldUseNativeFrame() OVERRIDE;
+  virtual bool ShouldUseNativeFrame() const OVERRIDE;
   virtual void FrameTypeChanged() OVERRIDE;
 
   void UpdateDWMFrame();
 
   MARGINS GetDWMFrameMargins() const;
 
   BrowserView* browser_view_;
   BrowserFrame* browser_frame_;
 
   MinimizeButtonMetrics minimize_button_metrics_;
 
   scoped_ptr<BrowserWindowPropertyManager> browser_window_property_manager_;
 
   // The wrapped system menu itself.
   scoped_ptr<views::NativeMenuWin> system_menu_;
 
   // Necessary to avoid corruption on NC paint in Aero mode.
   bool did_gdi_clear_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserDesktopWindowTreeHostWin);
 };
 
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_ROOT_WINDOW_HOST_WIN_H_