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

remoting/host/policy_hack/policy_watcher_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/basictypes.h"
 #include "base/bind.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "remoting/host/dns_blackhole_checker.h"
 #include "remoting/host/policy_hack/fake_policy_watcher.h"
 #include "remoting/host/policy_hack/mock_policy_callback.h"
 #include "remoting/host/policy_hack/policy_watcher.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace remoting {
 namespace policy_hack {
@@ skipping 285 matching lines @@
       OnPolicyUpdatePtr(IsPolicies(&nat_true_others_default_)));
 #endif
 
   StartWatching();
   policy_watcher_->SetPolicies(&nat_true_and_overridden_);
   StopWatching();
 }
 
 }  // namespace policy_hack
 }  // namespace remoting