Remove base/win/metro.{cc|h} and some associated code

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

 // Copyright 2013 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/native_browser_frame_factory.h"
 
 #include "chrome/browser/ui/views/frame/desktop_browser_frame_auralinux.h"
 
-#if defined(USE_ASH)
-#include "chrome/browser/ui/views/frame/browser_frame_ash.h"
-#endif
-
 #if defined(MOJO_SHELL_CLIENT)
 #include "chrome/browser/ui/views/frame/browser_frame_mus.h"
 #include "content/public/common/mojo_shell_connection.h"
 #endif
 
 NativeBrowserFrame* NativeBrowserFrameFactory::Create(
     BrowserFrame* browser_frame,
     BrowserView* browser_view) {
 #if defined(MOJO_SHELL_CLIENT)
   if (content::MojoShellConnection::Get())
     return new BrowserFrameMus(browser_frame, browser_view);
 #endif
 
-#if defined(USE_ASH)
-  if (ShouldCreateForAshDesktop(browser_view))
-    return new BrowserFrameAsh(browser_frame, browser_view);
-#endif
-
   return new DesktopBrowserFrameAuraLinux(browser_frame, browser_view);
 }