Subject .mm files to the header sorting presubmit

chrome/browser/ui/cocoa/media_picker/desktop_media_picker_controller_unittest.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/media_picker/desktop_media_picker_controller.h"
 
 #include "base/bind.h"
+#include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
-#include "base/run_loop.h"
 #include "chrome/browser/media/desktop_media_list_observer.h"
 #include "chrome/browser/media/fake_desktop_media_list.h"
 #import "chrome/browser/ui/cocoa/cocoa_test_helper.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest_mac.h"
 
 @interface DesktopMediaPickerController (ExposedForTesting)
 - (IKImageBrowserView*)sourceBrowser;
 - (NSButton*)shareButton;
 - (NSArray*)items;
@@ skipping 182 matching lines @@
   media_list_->SetSourceName(1, base::ASCIIToUTF16("foo"));
   NSArray* items = [controller_ items];
   EXPECT_NSEQ(@"foo", [[items objectAtIndex:1] imageTitle]);
 
   media_list_->MoveSource(1, 0);
   EXPECT_NSEQ(@"foo", [[items objectAtIndex:0] imageTitle]);
 
   media_list_->MoveSource(0, 1);
   EXPECT_NSEQ(@"foo", [[items objectAtIndex:1] imageTitle]);
 }