Subject .mm files to the header sorting presubmit

extensions/shell/browser/shell_desktop_controller_mac.mm

 // 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.
 
 #include "extensions/shell/browser/shell_desktop_controller_mac.h"
 
 #include "extensions/browser/app_window/native_app_window.h"
+#include "extensions/shell/browser/shell_app_delegate.h"
 #include "extensions/shell/browser/shell_app_window_client.h"
-#include "extensions/shell/browser/shell_app_delegate.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/screen.h"
 
 namespace extensions {
 
 ShellDesktopControllerMac::ShellDesktopControllerMac()
     : app_window_client_(new ShellAppWindowClient), app_window_(NULL) {
   AppWindowClient::Set(app_window_client_.get());
 }
@@ skipping 24 matching lines @@
 
 void ShellDesktopControllerMac::CloseAppWindows() {
   if (app_window_) {
     ui::BaseWindow* window = app_window_->GetBaseWindow();
     window->Close();  // Close() deletes |app_window_|.
     app_window_ = NULL;
   }
 }
 
 }  // namespace extensions