Re-write many calls to WrapUnique() with MakeUnique()

ios/chrome/browser/bookmarks/bookmark_model_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/bookmarks/bookmark_model_factory.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
@@ skipping 46 matching lines @@
     user_prefs::PrefRegistrySyncable* registry) {
   bookmarks::RegisterProfilePrefs(registry);
 }
 
 std::unique_ptr<KeyedService> BookmarkModelFactory::BuildServiceInstanceFor(
     web::BrowserState* context) const {
   ios::ChromeBrowserState* browser_state =
       ios::ChromeBrowserState::FromBrowserState(context);
   std::unique_ptr<bookmarks::BookmarkModel> bookmark_model(
       new bookmarks::BookmarkModel(
-          base::WrapUnique(new BookmarkClientImpl(browser_state))));
+          base::MakeUnique<BookmarkClientImpl>(browser_state)));
   bookmark_model->Load(
       browser_state->GetPrefs(),
       browser_state->GetStatePath(),
       ios::StartupTaskRunnerServiceFactory::GetForBrowserState(browser_state)
           ->GetBookmarkTaskRunner(),
       web::WebThread::GetTaskRunnerForThread(web::WebThread::UI));
   ios::BookmarkUndoServiceFactory::GetForBrowserState(browser_state)
       ->Start(bookmark_model.get());
   return std::move(bookmark_model);
 }
 
 web::BrowserState* BookmarkModelFactory::GetBrowserStateToUse(
     web::BrowserState* context) const {
   return GetBrowserStateRedirectedInIncognito(context);
 }
 
 bool BookmarkModelFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }
 
 }  // namespace ios