Require explicit selection of traits for LazyInstance

ios/chrome/browser/update_client/ios_chrome_update_query_params_delegate.cc

 // Copyright 2015 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 "ios/chrome/browser/update_client/ios_chrome_update_query_params_delegate.h"
 
 #include "base/lazy_instance.h"
 #include "base/strings/stringprintf.h"
 #include "components/version_info/version_info.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/common/channel_info.h"
 
 namespace {
 
-base::LazyInstance<IOSChromeUpdateQueryParamsDelegate> g_delegate =
-    LAZY_INSTANCE_INITIALIZER;
+base::LazyInstance<IOSChromeUpdateQueryParamsDelegate>::DestructorAtExit
+    g_delegate = LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 IOSChromeUpdateQueryParamsDelegate::IOSChromeUpdateQueryParamsDelegate() {}
 
 IOSChromeUpdateQueryParamsDelegate::~IOSChromeUpdateQueryParamsDelegate() {}
 
 // static
 IOSChromeUpdateQueryParamsDelegate*
 IOSChromeUpdateQueryParamsDelegate::GetInstance() {
   return g_delegate.Pointer();
 }
 
 std::string IOSChromeUpdateQueryParamsDelegate::GetExtraParams() {
   return base::StringPrintf(
       "&prodchannel=%s&prodversion=%s&lang=%s", GetChannelString().c_str(),
       version_info::GetVersionNumber().c_str(), GetLang().c_str());
 }
 
 // static
 const std::string& IOSChromeUpdateQueryParamsDelegate::GetLang() {
   return GetApplicationContext()->GetApplicationLocale();
 }