Use a direct include of the message_loop header in content/, part 4.

content/renderer/devtools/devtools_agent.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 "content/renderer/devtools/devtools_agent.h"
 
 #include <map>
 
 #include "base/debug/trace_event.h"
 #include "base/lazy_instance.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/process.h"
 #include "base/strings/string_number_conversions.h"
 #include "content/common/devtools_messages.h"
 #include "content/common/view_messages.h"
 #include "content/renderer/devtools/devtools_agent_filter.h"
 #include "content/renderer/devtools/devtools_client.h"
 #include "content/renderer/render_view_impl.h"
 #include "third_party/WebKit/public/platform/WebPoint.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebConsoleMessage.h"
@@ skipping 233 matching lines @@
   if (!web_view)
     return NULL;
   return web_view->devToolsAgent();
 }
 
 bool DevToolsAgent::IsAttached() {
   return is_attached_;
 }
 
 }  // namespace content