Convert //printing to use std::unique_ptr

printing/printing_context_mac.mm

 // 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.
 
 #include "printing/printing_context_mac.h"
 
 #import <AppKit/AppKit.h>
 
 #import <iomanip>
 #import <numeric>
 
 #include "base/logging.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "printing/print_settings_initializer_mac.h"
 #include "printing/units.h"
 
 namespace printing {
 
 namespace {
 
@@ skipping 34 matching lines @@
       best_matching_paper = paper;
       best_match = difference;
     }
   }
   return best_matching_paper;
 }
 
 }  // namespace
 
 // static
-scoped_ptr<PrintingContext> PrintingContext::Create(Delegate* delegate) {
-  return make_scoped_ptr<PrintingContext>(new PrintingContextMac(delegate));
+std::unique_ptr<PrintingContext> PrintingContext::Create(Delegate* delegate) {
+  return base::WrapUnique(new PrintingContextMac(delegate));
 }
 
 PrintingContextMac::PrintingContextMac(Delegate* delegate)
     : PrintingContext(delegate),
       print_info_([[NSPrintInfo sharedPrintInfo] copy]),
       context_(NULL) {
 }
 
 PrintingContextMac::~PrintingContextMac() {
   ReleaseContext();
@@ skipping 432 matching lines @@
 void PrintingContextMac::ReleaseContext() {
   print_info_.reset();
   context_ = NULL;
 }
 
 gfx::NativeDrawingContext PrintingContextMac::context() const {
   return context_;
 }
 
 }  // namespace printing