Remove NOTIFICATION_EXTENSION_ENABLED.

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 8156b79538ea25d3d2f35e075d54056b156be816..64e5b44485088bfc1aa4a5a73155f693f69c7d4b 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -928,10 +928,7 @@ void ExtensionService::EnableExtension(const std::string& extension_id) {
   NotifyExtensionLoaded(extension);
 
   // Notify listeners that the extension was enabled.
-  content::NotificationService::current()->Notify(
-      extensions::NOTIFICATION_EXTENSION_ENABLED,
-      content::Source<Profile>(profile_),
-      content::Details<const Extension>(extension));
+  registry_->TriggerOnEnabled(extension);
 }
 
 void ExtensionService::DisableExtension(const std::string& extension_id,