Subject .mm files to the header sorting presubmit

chrome/browser/platform_util_mac.mm

 // 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/platform_util.h"
 
 #include <Carbon/Carbon.h>
 #import <Cocoa/Cocoa.h>
 #include <CoreServices/CoreServices.h>
 
 #include "base/bind.h"
+#include "base/files/file_path.h"
 #include "base/files/file_util.h"
-#include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/mac/mac_logging.h"
 #import "base/mac/mac_util.h"
+#include "base/mac/scoped_aedesc.h"
 #import "base/mac/sdk_forward_declarations.h"
-#include "base/mac/scoped_aedesc.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/platform_util_internal.h"
 #include "content/public/browser/browser_thread.h"
 #include "url/gurl.h"
 
 namespace platform_util {
 
 void ShowItemInFolder(Profile* profile, const base::FilePath& full_path) {
   DCHECK([NSThread isMainThread]);
   NSString* path_string = base::SysUTF8ToNSString(full_path.value());
@@ skipping 172 matching lines @@
           [[view window] isVisible]);
 }
 
 bool IsSwipeTrackingFromScrollEventsEnabled() {
   SEL selector = @selector(isSwipeTrackingFromScrollEventsEnabled);
   return [NSEvent respondsToSelector:selector]
       && [NSEvent performSelector:selector];
 }
 
 }  // namespace platform_util