Use a direct include of the message_loop header in chrome/browser/, part 7.

chrome/browser/nacl_host/nacl_process_host.h

 // 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.
 
 #ifndef CHROME_BROWSER_NACL_HOST_NACL_PROCESS_HOST_H_
 #define CHROME_BROWSER_NACL_HOST_NACL_PROCESS_HOST_H_
 
 #include "build/build_config.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util_proxy.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/process.h"
 #include "chrome/common/nacl_types.h"
 #include "content/public/browser/browser_child_process_host_delegate.h"
 #include "content/public/browser/browser_child_process_host_iterator.h"
 #include "ipc/ipc_channel_handle.h"
 #include "net/socket/tcp_listen_socket.h"
 #include "ppapi/shared_impl/ppapi_permissions.h"
 #include "url/gurl.h"
 
 class CommandLine;
@@ skipping 182 matching lines @@
   PluginListener ipc_plugin_listener_;
   // Browser host for plugin process.
   scoped_ptr<content::BrowserPpapiHost> ppapi_host_;
 
   int render_view_id_;
 
   DISALLOW_COPY_AND_ASSIGN(NaClProcessHost);
 };
 
 #endif  // CHROME_BROWSER_NACL_HOST_NACL_PROCESS_HOST_H_