Remove enable_notifications build flag and define

chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc

 // Copyright 2013 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/profiles/chrome_browser_main_extra_parts_profiles.h"
 
 #include <memory>
 #include <utility>
 
 #include "build/build_config.h"
@@ skipping 196 matching lines @@
   chrome::android::DataUseUITabModelFactory::GetInstance();
 #endif
   UINetworkQualityEstimatorServiceFactory::GetInstance();
 #if BUILDFLAG(ENABLE_PRINT_PREVIEW)
   CloudPrintProxyServiceFactory::GetInstance();
 #endif
   CookieSettingsFactory::GetInstance();
 #if !defined(OS_ANDROID) && !defined(OS_CHROMEOS)
   CrossDevicePromoFactory::GetInstance();
 #endif
-#if defined(ENABLE_NOTIFICATIONS)
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   ExtensionWelcomeNotificationFactory::GetInstance();
 #endif
   NotifierStateTrackerFactory::GetInstance();
-#endif  // defined(ENABLE_NOTIFICATIONS)
   data_use_measurement::ChromeDataUseAscriberServiceFactory::GetInstance();
   dom_distiller::DomDistillerServiceFactory::GetInstance();
   domain_reliability::DomainReliabilityServiceFactory::GetInstance();
   DownloadServiceFactory::GetInstance();
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   EasyUnlockServiceFactory::GetInstance();
   EnhancedBookmarkKeyServiceFactory::GetInstance();
 #endif
 #if defined(OS_CHROMEOS)
   chromeos::PrinterDetectorFactory::GetInstance();
@@ skipping 111 matching lines @@
 #endif
 #if !defined(OS_ANDROID)
   UsbChooserContextFactory::GetInstance();
 #endif
   WebDataServiceFactory::GetInstance();
 }
 
 void ChromeBrowserMainExtraPartsProfiles::PreProfileInit() {
   EnsureBrowserContextKeyedServiceFactoriesBuilt();
 }