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

components/printing/test/print_mock_render_thread.h

 // Copyright (c) 2011 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.
 
 #ifndef COMPONENTS_PRINTING_TEST_PRINT_MOCK_RENDER_THREAD_H_
 #define COMPONENTS_PRINTING_TEST_PRINT_MOCK_RENDER_THREAD_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 11 matching lines @@
 struct PrintMsg_PrintPages_Params;
 struct PrintMsg_Print_Params;
 
 // Extends content::MockRenderThread to know about printing
 class PrintMockRenderThread : public content::MockRenderThread {
  public:
   PrintMockRenderThread();
   ~PrintMockRenderThread() override;
 
   // content::RenderThread overrides.
-  scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() override;
+  scoped_refptr<base::SingleThreadTaskRunner> GetIOMessageLoopProxy() override;
 
   //////////////////////////////////////////////////////////////////////////
   // The following functions are called by the test itself.
 
   // Set IO message loop proxy.
   void set_io_message_loop_proxy(
       const scoped_refptr<base::MessageLoopProxy>& proxy);
 
 #if defined(ENABLE_PRINTING)
   // Returns the pseudo-printer instance.
@@ skipping 57 matching lines @@
   // Number of pages to generate for print preview.
   int print_preview_pages_remaining_;
 #endif
 
   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintMockRenderThread);
 };
 
 #endif  // COMPONENTS_PRINTING_TEST_PRINT_MOCK_RENDER_THREAD_H_