Remove NOTIFICATION_EXTENSION_ENABLED.

chrome/browser/extensions/extension_service.cc

 // Copyright (c) 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/extensions/extension_service.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <iterator>
@@ skipping 910 matching lines @@
   if (!extension)
     return;
 
   // Move it over to the enabled list.
   registry_->AddEnabled(make_scoped_refptr(extension));
   registry_->RemoveDisabled(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,
                                         int disable_reasons) {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   if (extension_prefs_->IsExtensionBlacklisted(extension_id))
     return;
 
   // The extension may have been disabled already. Just add the disable reasons.
@@ skipping 1619 matching lines @@
 }
 
 void ExtensionService::OnProfileDestructionStarted() {
   ExtensionIdSet ids_to_unload = registry_->enabled_extensions().GetIDs();
   for (ExtensionIdSet::iterator it = ids_to_unload.begin();
        it != ids_to_unload.end();
        ++it) {
     UnloadExtension(*it, UnloadedExtensionReason::PROFILE_SHUTDOWN);
   }
 }