Widget::ShouldUseNativeFrame is now meaningful on Linux.

chrome/browser/ui/views/frame/browser_desktop_root_window_host_win.cc

 // 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.
 
 #include "chrome/browser/ui/views/frame/browser_desktop_root_window_host_win.h"
 
 #include <dwmapi.h>
 
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/themes/theme_service.h"
@@ skipping 235 matching lines @@
   if (!browser_view_->IsBrowserTypeNormal() &&
       !DesktopWindowTreeHostWin::IsUsingCustomFrame()) {
     return false;
   }
 
   // Otherwise, we use the native frame when we're told we should by the theme
   // provider (e.g. no custom theme is active).
   return !GetWidget()->GetThemeProvider()->ShouldUseNativeFrame();
 }
 
-bool BrowserDesktopWindowTreeHostWin::ShouldUseNativeFrame() {
+bool BrowserDesktopWindowTreeHostWin::ShouldUseNativeFrame() const {
   if (!views::DesktopWindowTreeHostWin::ShouldUseNativeFrame())
     return false;
   // This function can get called when the Browser window is closed i.e. in the
   // context of the BrowserView destructor.
   if (!browser_view_->browser())
     return false;
   return chrome::ShouldUseNativeFrame(browser_view_,
                                       GetWidget()->GetThemeProvider());
 }
 
@@ skipping 58 matching lines @@
     BrowserDesktopWindowTreeHost::CreateBrowserDesktopWindowTreeHost(
         views::internal::NativeWidgetDelegate* native_widget_delegate,
         views::DesktopNativeWidgetAura* desktop_native_widget_aura,
         BrowserView* browser_view,
         BrowserFrame* browser_frame) {
   return new BrowserDesktopWindowTreeHostWin(native_widget_delegate,
                                              desktop_native_widget_aura,
                                              browser_view,
                                              browser_frame);
 }