Use a direct include of the message_loop header in content/, part 3.

content/plugin/plugin_main.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 "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include "base/bind.h"
 #include "base/command_line.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/power_monitor/power_monitor.h"
 #include "base/strings/string_util.h"
 #include "base/threading/platform_thread.h"
 #include "base/timer/hi_res_timer_manager.h"
 #include "content/child/child_process.h"
 #include "content/common/content_constants_internal.h"
 #include "content/plugin/plugin_thread.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
 
@@ skipping 57 matching lines @@
   {
     ChildProcess plugin_process;
     plugin_process.set_main_thread(new PluginThread());
     base::MessageLoop::current()->Run();
   }
 
   return 0;
 }
 
 }  // namespace content