Subject .mm files to the header sorting presubmit

chrome/browser/ui/cocoa/notifications/message_center_tray_bridge_unittest.mm

 // Copyright (c) 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/notifications/message_center_tray_bridge.h"
 
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/pref_names.h"
+#include "chrome/test/base/scoped_testing_local_state.h"
 #include "chrome/test/base/testing_browser_process.h"
-#include "chrome/test/base/scoped_testing_local_state.h"
 #import "ui/gfx/test/ui_cocoa_test_helper.h"
 #import "ui/message_center/cocoa/status_item_view.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/notification.h"
 #include "ui/message_center/notifier_settings.h"
 
 class MessageCenterTrayBridgeTest : public ui::CocoaTest {
  public:
   void SetUp() override {
     ui::CocoaTest::SetUp();
@@ skipping 121 matching lines @@
   center_->RemoveNotification("1", /*by_user=*/true);
 
   base::RunLoop().RunUntilIdle();
 
   EXPECT_FALSE(status_item());
 
   local_state()->SetBoolean(prefs::kMessageCenterShowIcon, true);
 
   EXPECT_TRUE(status_item());
 }