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

base/message_loop/message_loop_proxy_unittest.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/message_loop/message_loop_proxy.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/debug/leak_annotations.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 namespace {
 
 class MessageLoopProxyTest : public testing::Test {
  public:
@@ skipping 234 matching lines @@
   // it, we cannot just delete it because PostTaskAndReplyRelay's destructor
   // checks that MessageLoop::current() is the the same as when the
   // PostTaskAndReplyRelay object was constructed.  However, this loop must have
   // aleady been deleted in order to perform this test.  See
   // http://crbug.com/86301.
 }
 
 }  // namespace
 
 }  // namespace base