Subject .mm files to the header sorting presubmit

ui/views/widget/native_widget_mac_interactive_uitest.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 "ui/views/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
+#include "ui/views/test/test_widget_observer.h"
 #include "ui/views/test/widget_test.h"
-#include "ui/views/test/test_widget_observer.h"
 
 namespace views {
 namespace test {
 
 // Tests for NativeWidgetMac that rely on global window manager state, and can
 // not be parallelized.
 class NativeWidgetMacInteractiveUITest
     : public WidgetTest,
       public ::testing::WithParamInterface<bool> {
  public:
@@ skipping 107 matching lines @@
   widget2->CloseNow();
   widget->CloseNow();
 }
 
 INSTANTIATE_TEST_CASE_P(NativeWidgetMacInteractiveUITestInstance,
                         NativeWidgetMacInteractiveUITest,
                         ::testing::Bool());
 
 }  // namespace test
 }  // namespace views