Convert //printing to use std::unique_ptr

printing/printing_context_no_system_dialog.cc

Index: printing/printing_context_no_system_dialog.cc
diff --git a/printing/printing_context_no_system_dialog.cc b/printing/printing_context_no_system_dialog.cc
index ec8aaaf2d3c08fd1a420dc8c5cbe7e6c5fe1101b..5f8db1a62ca6c32d5617aacdb92ee974c8d567f3 100644
--- a/printing/printing_context_no_system_dialog.cc
+++ b/printing/printing_context_no_system_dialog.cc
@@ -8,6 +8,7 @@
 #include <unicode/ulocdata.h>
 
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "printing/metafile.h"
 #include "printing/print_job_constants.h"
@@ -16,9 +17,8 @@
 namespace printing {
 
 // static
-scoped_ptr<PrintingContext> PrintingContext::Create(Delegate* delegate) {
-  return make_scoped_ptr<PrintingContext>(
-      new PrintingContextNoSystemDialog(delegate));
+std::unique_ptr<PrintingContext> PrintingContext::Create(Delegate* delegate) {
+  return base::WrapUnique(new PrintingContextNoSystemDialog(delegate));
 }
 
 PrintingContextNoSystemDialog::PrintingContextNoSystemDialog(Delegate* delegate)