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

base/win/metro.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/win/metro.h"
 
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/strings/string_util.h"
 #include "base/win/scoped_comptr.h"
 #include "base/win/windows_version.h"
 
 namespace base {
 namespace win {
 
 namespace {
 bool g_should_tsf_aware_required = false;
 }
@@ skipping 160 matching lines @@
         reinterpret_cast<GetInitialSearchString>(
             ::GetProcAddress(metro, "GetInitialSearchString"));
     DCHECK(initial_search_string);
     *params = initial_search_string();
   }
   return launch_type;
 }
 
 }  // namespace win
 }  // namespace base