Add missing IWYU message_loop.h includes.

chrome/browser/devtools/device/android_device_manager.cc

 // Copyright 2014 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 "chrome/browser/devtools/device/android_device_manager.h"
 
 #include <stddef.h>
 #include <string.h>
 
 #include <utility>
 
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
+#include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/socket/stream_socket.h"
 
 using content::BrowserThread;
 
@@ skipping 525 matching lines @@
           new Device(handler_thread_->message_loop(), it->provider, it->serial);
     } else {
       device = found->second.get();
     }
     response.push_back(device);
     new_devices[it->serial] = device->weak_factory_.GetWeakPtr();
   }
   devices_.swap(new_devices);
   callback.Run(response);
 }