Protector adds the default prepopulated engine if it was removed.

chrome/browser/search_engines/template_url_service.cc

Index: chrome/browser/search_engines/template_url_service.cc
diff --git a/chrome/browser/search_engines/template_url_service.cc b/chrome/browser/search_engines/template_url_service.cc
index d1314053af73d3690a11ebfdc6d61416d2b035dd..982d8f43a8c33d7cb0bec7b6474c99b2f2ad9161 100644
--- a/chrome/browser/search_engines/template_url_service.cc
+++ b/chrome/browser/search_engines/template_url_service.cc
@@ -322,6 +322,12 @@ void TemplateURLService::Remove(const TemplateURL* template_url) {
   NotifyObservers();
 }
 
+void TemplateURLService::Update(const TemplateURL* existing_turl,
+                                const TemplateURL& new_values) {
+  UpdateNoNotify(existing_turl, new_values);

[sky, 2011/11/28 17:03:11]

Add test coverage of this.

[Ivan Korotkov, 2011/11/29 10:13:47]

Done.

+  NotifyObservers();
+}
+
 void TemplateURLService::RemoveAutoGeneratedBetween(base::Time created_after,
                                                     base::Time created_before) {
   bool should_notify = false;