Convert NOTIFICATION_TEMPLATE_URL_SERVICE_LOADED to CallbackList

chrome/browser/importer/external_process_importer_host.cc

Index: chrome/browser/importer/external_process_importer_host.cc
diff --git a/chrome/browser/importer/external_process_importer_host.cc b/chrome/browser/importer/external_process_importer_host.cc
index 28ccd3ffe3b9b0fc72221ae8f92417b7584d1900..9af964193f37f3a8461a53e7ad27d54e5435a7e4 100644
--- a/chrome/browser/importer/external_process_importer_host.cc
+++ b/chrome/browser/importer/external_process_importer_host.cc
@@ -16,7 +16,6 @@
 #include "chrome/browser/search_engines/template_url_service.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
 #include "content/public/browser/browser_thread.h"
-#include "content/public/browser/notification_source.h"
 
 using content::BrowserThread;
 
@@ -99,7 +98,7 @@ ExternalProcessImporterHost::~ExternalProcessImporterHost() {
 }
 
 void ExternalProcessImporterHost::LaunchImportIfReady() {
-  if (waiting_for_bookmarkbar_model_ || !registrar_.IsEmpty() ||
+  if (waiting_for_bookmarkbar_model_ || template_service_subscription_.get() ||
       !is_source_readable_ || cancelled_)
     return;
 
@@ -135,11 +134,8 @@ void ExternalProcessImporterHost::BookmarkModelBeingDeleted(
 void ExternalProcessImporterHost::BookmarkModelChanged() {
 }
 
-void ExternalProcessImporterHost::Observe(int type,
-                           const content::NotificationSource& source,
-                           const content::NotificationDetails& details) {
-  DCHECK_EQ(type, chrome::NOTIFICATION_TEMPLATE_URL_SERVICE_LOADED);
-  registrar_.RemoveAll();
+void ExternalProcessImporterHost::OnTemplateURLServiceLoaded() {
+  template_service_subscription_.reset();
   LaunchImportIfReady();
 }
 
@@ -208,8 +204,9 @@ void ExternalProcessImporterHost::CheckForLoadedModels(uint16 items) {
     if (!writer_->TemplateURLServiceIsLoaded()) {
       TemplateURLService* model =
           TemplateURLServiceFactory::GetForProfile(profile_);
-      registrar_.Add(this, chrome::NOTIFICATION_TEMPLATE_URL_SERVICE_LOADED,
-                     content::Source<TemplateURLService>(model));
+      template_service_subscription_ = model->RegisterOnLoadedCallback(
+          base::Bind(&ExternalProcessImporterHost::OnTemplateURLServiceLoaded,
+                     weak_ptr_factory_.GetWeakPtr()));
       model->Load();
     }
   }