Move enable extensions define to a build flag.

chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc

Index: chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
diff --git a/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc b/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
index 2eaf0ad8b6a993764a29696b64a8a89131537640..2dcb1d243eeac1b469a77a4baf132cea6fde4add 100644
--- a/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
+++ b/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
@@ -70,9 +70,10 @@
 #include "chrome/browser/undo/bookmark_undo_service_factory.h"
 #include "chrome/browser/web_data_service_factory.h"
 #include "chrome/common/features.h"
+#include "extensions/features/features.h"
 #include "printing/features/features.h"
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "apps/browser_context_keyed_service_factories.h"
 #include "chrome/browser/apps/shortcut_manager_factory.h"
 #include "chrome/browser/extensions/api/networking_private/networking_private_ui_delegate_factory_impl.h"
@@ -174,7 +175,7 @@ ChromeBrowserMainExtraPartsProfiles::~ChromeBrowserMainExtraPartsProfiles() {
 // static
 void ChromeBrowserMainExtraPartsProfiles::
 EnsureBrowserContextKeyedServiceFactoriesBuilt() {
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   apps::EnsureBrowserContextKeyedServiceFactoriesBuilt();
   extensions::EnsureBrowserContextKeyedServiceFactoriesBuilt();
   extensions::ExtensionManagementFactory::GetInstance();
@@ -212,7 +213,7 @@ EnsureBrowserContextKeyedServiceFactoriesBuilt() {
   CrossDevicePromoFactory::GetInstance();
 #endif
 #if defined(ENABLE_NOTIFICATIONS)
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   ExtensionWelcomeNotificationFactory::GetInstance();
 #endif
   NotifierStateTrackerFactory::GetInstance();
@@ -221,7 +222,7 @@ EnsureBrowserContextKeyedServiceFactoriesBuilt() {
   dom_distiller::DomDistillerServiceFactory::GetInstance();
   domain_reliability::DomainReliabilityServiceFactory::GetInstance();
   DownloadServiceFactory::GetInstance();
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   EasyUnlockServiceFactory::GetInstance();
   EnhancedBookmarkKeyServiceFactory::GetInstance();
 #endif
@@ -238,7 +239,7 @@ EnsureBrowserContextKeyedServiceFactoriesBuilt() {
 #endif
   GoogleURLTrackerFactory::GetInstance();
   HistoryServiceFactory::GetInstance();
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   HotwordServiceFactory::GetInstance();
 #endif
   HostContentSettingsMapFactory::GetInstance();
@@ -258,7 +259,7 @@ EnsureBrowserContextKeyedServiceFactoriesBuilt() {
   SupervisedUserSyncServiceFactory::GetInstance();
 #endif
 #endif
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #if defined(OS_CHROMEOS) || defined(OS_WIN) || defined(OS_MACOSX)
   std::unique_ptr<extensions::NetworkingPrivateVerifyDelegateFactoryImpl>
       networking_private_verify_delegate_factory(