Use a direct include of the message_loop header in base/.

base/test/sequenced_worker_pool_owner.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 "base/test/sequenced_worker_pool_owner.h"
 
 #include "base/location.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 
 namespace base {
 
 SequencedWorkerPoolOwner::SequencedWorkerPoolOwner(
     size_t max_threads,
     const std::string& thread_name_prefix)
     : constructor_message_loop_(MessageLoop::current()),
       pool_(new SequencedWorkerPool(max_threads, thread_name_prefix, this)),
       has_work_call_count_(0) {}
 
@@ skipping 27 matching lines @@
   }
 }
 
 void SequencedWorkerPoolOwner::OnDestruct() {
   constructor_message_loop_->PostTask(
       FROM_HERE,
       constructor_message_loop_->QuitWhenIdleClosure());
 }
 
 }  // namespace base