Remove calls to MessageLoop::current() in chrome.

chrome/service/cloud_print/printer_job_handler.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 "chrome/service/cloud_print/printer_job_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file_util.h"
 #include "base/json/json_reader.h"
@@ skipping 794 matching lines @@
                            job_details.print_data_mime_type_,
                            printer_name,
                            base::UTF16ToUTF8(document_name),
                            job_details.tags_,
                            this)) {
     OnJobSpoolFailed();
   }
 }
 
 bool PrinterJobHandler::CurrentlyOnPrintThread() const {
-  return base::MessageLoop::current() == print_thread_.message_loop();
+  return print_thread_.task_runner()->BelongsToCurrentThread();
 }
 
 }  // namespace cloud_print