Remove enable_notifications build flag and define

chrome/browser/push_messaging/push_messaging_service_impl.h

Index: chrome/browser/push_messaging/push_messaging_service_impl.h
diff --git a/chrome/browser/push_messaging/push_messaging_service_impl.h b/chrome/browser/push_messaging/push_messaging_service_impl.h
index 59dd061e4eb00ebf2931bea6689135ec1fcb3f35..66c769496bdd1c3965ffdfd03b1fa43f4981f927 100644
--- a/chrome/browser/push_messaging/push_messaging_service_impl.h
+++ b/chrome/browser/push_messaging/push_messaging_service_impl.h
@@ -16,6 +16,7 @@
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/background/background_trigger.h"
+#include "chrome/browser/push_messaging/push_messaging_notification_manager.h"
 #include "chrome/common/features.h"
 #include "components/content_settings/core/browser/content_settings_observer.h"
 #include "components/content_settings/core/common/content_settings.h"
@@ -30,10 +31,6 @@
 #include "third_party/WebKit/public/platform/modules/permissions/permission_status.mojom.h"
 #include "third_party/WebKit/public/platform/modules/push_messaging/WebPushPermissionStatus.h"
 
-#if defined(ENABLE_NOTIFICATIONS)
-#include "chrome/browser/push_messaging/push_messaging_notification_manager.h"
-#endif
-
 class Profile;
 class PushMessagingAppIdentifier;
 class PushMessagingServiceObserver;
@@ -252,9 +249,7 @@ class PushMessagingServiceImpl : public content::PushMessagingService,
   base::Closure message_callback_for_testing_;
   base::Closure content_setting_changed_callback_for_testing_;
 
-#if defined(ENABLE_NOTIFICATIONS)
   PushMessagingNotificationManager notification_manager_;
-#endif
 
   // A multiset containing one entry for each in-flight push message delivery,
   // keyed by the receiver's app id.