Remove enable_notifications build flag and define

chrome/test/base/testing_browser_process.cc

Index: chrome/test/base/testing_browser_process.cc
diff --git a/chrome/test/base/testing_browser_process.cc b/chrome/test/base/testing_browser_process.cc
index 483e99dfd41351f67644ca7d7f5fb416b30f1ace..ef9d8f0aff090d17695f37b37ef4b250b518c184 100644
--- a/chrome/test/base/testing_browser_process.cc
+++ b/chrome/test/base/testing_browser_process.cc
@@ -221,7 +221,7 @@ TestingBrowserProcess::extension_event_router_forwarder() {
 }
 
 NotificationUIManager* TestingBrowserProcess::notification_ui_manager() {
-#if defined(ENABLE_NOTIFICATIONS) && !defined(OS_ANDROID)
+#if !defined(OS_ANDROID)
   if (!notification_ui_manager_.get())
     notification_ui_manager_.reset(NotificationUIManager::Create());
   return notification_ui_manager_.get();