content/child: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

components/printing/test/print_mock_render_thread.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 "components/printing/test/print_mock_render_thread.h"
 
 #include <vector>
 
 #include "base/values.h"
 #include "components/printing/test/mock_printer.h"
@@ skipping 18 matching lines @@
       print_dialog_user_response_(true),
       print_preview_cancel_page_number_(-1),
       print_preview_pages_remaining_(0)
 #endif
 {
 }
 
 PrintMockRenderThread::~PrintMockRenderThread() {
 }
 
-scoped_refptr<base::MessageLoopProxy>
+scoped_refptr<base::SingleThreadTaskRunner>
 PrintMockRenderThread::GetIOMessageLoopProxy() {
   return io_message_loop_proxy_;
 }
 
 void PrintMockRenderThread::set_io_message_loop_proxy(
     const scoped_refptr<base::MessageLoopProxy>& proxy) {
   io_message_loop_proxy_ = proxy;
 }
 
 bool PrintMockRenderThread::OnMessageReceived(const IPC::Message& msg) {
@@ skipping 158 matching lines @@
 }
 
 void PrintMockRenderThread::set_print_preview_cancel_page_number(int page) {
   print_preview_cancel_page_number_ = page;
 }
 
 int PrintMockRenderThread::print_preview_pages_remaining() const {
   return print_preview_pages_remaining_;
 }
 #endif  // defined(ENABLE_PRINTING)