Update SupportsUserData uses with unique_ptr.

chrome/browser/autocomplete/shortcuts_backend_factory.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 "chrome/browser/autocomplete/shortcuts_backend_factory.h"
 
 #include <memory>
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/history/history_service_factory.h"
@@ skipping 83 matching lines @@
     bool suppress_db) {
   scoped_refptr<ShortcutsBackend> backend(new ShortcutsBackend(
       TemplateURLServiceFactory::GetForProfile(profile),
       base::MakeUnique<UIThreadSearchTermsData>(profile),
       HistoryServiceFactory::GetForProfile(profile,
                                            ServiceAccessType::EXPLICIT_ACCESS),
       content::BrowserThread::GetTaskRunnerForThread(
           content::BrowserThread::DB),
       profile->GetPath().Append(kShortcutsDatabaseName), suppress_db));
 #if BUILDFLAG(ENABLE_EXTENSIONS)
-  ShortcutsExtensionsManager* extensions_manager =
-      new ShortcutsExtensionsManager(profile);
-  profile->SetUserData(kShortcutsExtensionsManagerKey, extensions_manager);
+  auto extensions_manager =
+      base::MakeUnique<ShortcutsExtensionsManager>(profile);
+  profile->SetUserData(kShortcutsExtensionsManagerKey,
+                       std::move(extensions_manager));
 #endif
   return backend->Init() ? backend : nullptr;
 }