Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/favicon/ios_chrome_large_icon_cache_factory.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/favicon/ios_chrome_large_icon_cache_factory.h"
 
+#include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "components/keyed_service/ios/browser_state_dependency_manager.h"
 #include "ios/chrome/browser/browser_state/browser_state_otr_helper.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/favicon/large_icon_cache.h"
 
 // static
 LargeIconCache* IOSChromeLargeIconCacheFactory::GetForBrowserState(
     ios::ChromeBrowserState* browser_state) {
   return static_cast<LargeIconCache*>(
       GetInstance()->GetServiceForBrowserState(browser_state, true));
 }
 
 // static
 IOSChromeLargeIconCacheFactory* IOSChromeLargeIconCacheFactory::GetInstance() {
   return base::Singleton<IOSChromeLargeIconCacheFactory>::get();
 }
 
 IOSChromeLargeIconCacheFactory::IOSChromeLargeIconCacheFactory()
     : BrowserStateKeyedServiceFactory(
           "LargeIconCache",
           BrowserStateDependencyManager::GetInstance()) {}
 
 IOSChromeLargeIconCacheFactory::~IOSChromeLargeIconCacheFactory() {}
 
-scoped_ptr<KeyedService>
+std::unique_ptr<KeyedService>
 IOSChromeLargeIconCacheFactory::BuildServiceInstanceFor(
     web::BrowserState* context) const {
-  return make_scoped_ptr(new LargeIconCache);
+  return base::WrapUnique(new LargeIconCache);
 }
 
 web::BrowserState* IOSChromeLargeIconCacheFactory::GetBrowserStateToUse(
     web::BrowserState* context) const {
   return GetBrowserStateOwnInstanceInIncognito(context);
 }