Add missing IWYU message_loop.h includes.

chrome/test/base/testing_profile.cc

 // 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/test/base/testing_profile.h"
 
 #include <utility>
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
+#include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "chrome/browser/autocomplete/in_memory_url_index_factory.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "chrome/browser/bookmarks/chrome_bookmark_client.h"
@@ skipping 1074 matching lines @@
   // Note: Owned by |original_profile|.
   return new TestingProfile(path_, delegate_,
 #if BUILDFLAG(ENABLE_EXTENSIONS)
                             extension_policy_,
 #endif
                             std::move(pref_service_), original_profile,
                             guest_session_, supervised_user_id_,
                             std::move(policy_service_), testing_factories_,
                             profile_name_);
 }