Remove all remaining traces of MessageLoopProxy.

chrome/browser/ui/libgtk2ui/print_dialog_gtk2.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/ui/libgtk2ui/print_dialog_gtk2.h"
 
 #include <gtk/gtkunixprint.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 517 matching lines @@
   gtk_print_job_send(print_job, OnJobCompletedThunk, this, NULL);
 }
 
 void PrintDialogGtk2::OnJobCompleted(GtkPrintJob* print_job,
                                      const GError* error) {
   if (error)
     LOG(ERROR) << "Printing failed: " << error->message;
   if (print_job)
     g_object_unref(print_job);
   base::FileUtilProxy::DeleteFile(
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE).get(),
-      path_to_pdf_,
-      false,
-      base::FileUtilProxy::StatusCallback());
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE).get(),
+      path_to_pdf_, false, base::FileUtilProxy::StatusCallback());
   // Printing finished. Matches AddRef() in PrintDocument();
   Release();
 }
 
 void PrintDialogGtk2::InitPrintSettings(PrintSettings* settings) {
   InitPrintSettingsGtk(gtk_settings_, page_setup_, settings);
   context_->InitWithSettings(*settings);
 }
 
 void PrintDialogGtk2::OnWindowDestroying(aura::Window* window) {
   DCHECK_EQ(libgtk2ui::GetAuraTransientParent(dialog_), window);
 
   libgtk2ui::ClearAuraTransientParent(dialog_);
   window->RemoveObserver(this);
   if (!callback_.is_null()) {
     callback_.Run(PrintingContextLinux::CANCEL);
     callback_.Reset();
   }
 }