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

content/browser/worker_host/worker_process_host.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/browser/worker_host/worker_process_host.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/appcache/appcache_dispatcher_host.h"
 #include "content/browser/appcache/chrome_appcache_service.h"
 #include "content/browser/browser_child_process_host_impl.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/devtools/worker_devtools_manager.h"
 #include "content/browser/devtools/worker_devtools_message_filter.h"
 #include "content/browser/fileapi/fileapi_message_filter.h"
 #include "content/browser/indexed_db/indexed_db_dispatcher_host.h"
@@ skipping 688 matching lines @@
   return false;
 }
 
 WorkerProcessHost::WorkerInstance::FilterInfo
 WorkerProcessHost::WorkerInstance::GetFilter() const {
   DCHECK(NumFilters() == 1);
   return *filters_.begin();
 }
 
 }  // namespace content