Remove deprecated extension notification from shortcuts_extensions_manager.h/cc

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/autocomplete/shortcuts_extensions_manager.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
 #include "chrome/browser/search_engines/ui_thread_search_terms_data.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/omnibox/browser/shortcuts_backend.h"
 #include "components/omnibox/browser/shortcuts_constants.h"
 #include "components/prefs/pref_service.h"
 #include "content/public/browser/browser_thread.h"
 #include "extensions/features/features.h"
 
+#if BUILDFLAG(ENABLE_EXTENSIONS)
+#include "chrome/browser/autocomplete/shortcuts_extensions_manager.h"
+
 namespace {
-#if BUILDFLAG(ENABLE_EXTENSIONS)
 const char kShortcutsExtensionsManagerKey[] = "ShortcutsExtensionsManager";
+}
 #endif
-}
 
 // static
 scoped_refptr<ShortcutsBackend> ShortcutsBackendFactory::GetForProfile(
     Profile* profile) {
   return static_cast<ShortcutsBackend*>(
       GetInstance()->GetServiceForBrowserContext(profile, true).get());
 }
 
 // static
 scoped_refptr<ShortcutsBackend> ShortcutsBackendFactory::GetForProfileIfExists(
@@ skipping 62 matching lines @@
       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);
 #endif
   return backend->Init() ? backend : nullptr;
 }