Update the time formatting APIs to use string16....

printing/printed_document_posix.cc

 // Copyright (c) 2009 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/printed_document.h"
 
 #include "base/i18n/time_formatting.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 
 using base::Time;
 
 namespace printing {
 
 void PrintedDocument::Immutable::SetDocumentDate() {
   Time now = Time::Now();
-  date_ = WideToUTF16Hack(base::TimeFormatShortDateNumeric(now));
-  time_ = WideToUTF16Hack(base::TimeFormatTimeOfDay(now));
+  date_ = base::TimeFormatShortDateNumeric(now);
+  time_ = base::TimeFormatTimeOfDay(now);
 }
 
 }  // namespace printing