Call scoped_refptr<T>::get() rather than relying on implicit "operator T*"

chrome/browser/printing/print_dialog_gtk.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/browser/printing/print_dialog_gtk.h"
 
 #include <fcntl.h>
 #include <gtk/gtkunixprint.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ skipping 389 matching lines @@
                                          GError* error) {
   static_cast<PrintDialogGtk*>(user_data)->OnJobCompleted(print_job, error);
 }
 
 void PrintDialogGtk::OnJobCompleted(GtkPrintJob* print_job, GError* error) {
   if (error)
     LOG(ERROR) << "Printing failed: " << error->message;
   if (print_job)
     g_object_unref(print_job);
   base::FileUtilProxy::Delete(
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE),
-      path_to_pdf_, false, base::FileUtilProxy::StatusCallback());
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE).get(),
+      path_to_pdf_,
+      false,
+      base::FileUtilProxy::StatusCallback());
   // Printing finished. Matches AddRef() in PrintDocument();
   Release();
 }
 
 void PrintDialogGtk::InitPrintSettings(const PageRanges& page_ranges,
                                        PrintSettings* settings) {
   printing::PrintSettingsInitializerGtk::InitPrintSettings(
       gtk_settings_, page_setup_, page_ranges, false, settings);
   context_->InitWithSettings(*settings);
 }