Require explicit selection of traits for LazyInstance

chrome/browser/net/sth_distributor_provider.cc

 // Copyright 2016 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/net/sth_distributor_provider.h"
 
 #include "base/lazy_instance.h"
 #include "net/cert/sth_distributor.h"
 
 namespace chrome_browser_net {
 
 namespace {
-base::LazyInstance<std::unique_ptr<net::ct::STHDistributor>>
+base::LazyInstance<std::unique_ptr<net::ct::STHDistributor>>::DestructorAtExit
     global_sth_distributor = LAZY_INSTANCE_INITIALIZER;
 }  // namespace
 
 void SetGlobalSTHDistributor(
     std::unique_ptr<net::ct::STHDistributor> distributor) {
   global_sth_distributor.Get().swap(distributor);
 }
 
 net::ct::STHDistributor* GetGlobalSTHDistributor() {
   CHECK(global_sth_distributor.Get());
   return global_sth_distributor.Get().get();
 }
 
 }  // namespace chrome_browser_net