Change a few LazyInstances in printing code to be Leaky.

printing/print_settings.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 "printing/print_settings.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "printing/print_job_constants.h"
 #include "printing/units.h"
 
 namespace printing {
 
-base::LazyInstance<std::string>::DestructorAtExit g_user_agent;
+base::LazyInstance<std::string>::Leaky g_user_agent;
 
 void SetAgent(const std::string& user_agent) {
   g_user_agent.Get() = user_agent;
 }
 
 const std::string& GetAgent() {
   return g_user_agent.Get();
 }
 
 #if defined(USE_CUPS)
@@ skipping 262 matching lines @@
 }
 
 void PrintSettings::SetOrientation(bool landscape) {
   if (landscape_ != landscape) {
     landscape_ = landscape;
     page_setup_device_units_.FlipOrientation();
   }
 }
 
 }  // namespace printing