[Android] Allow setting recently visited search engines as default search engine

components/search_engines/template_url_service.cc

Index: components/search_engines/template_url_service.cc
diff --git a/components/search_engines/template_url_service.cc b/components/search_engines/template_url_service.cc
index 29a06edce379fba99cde94c2a2966d280930b637..d8bb13d4a07e8806e616c2a29cc8ebfcd1fdcd4a 100644
--- a/components/search_engines/template_url_service.cc
+++ b/components/search_engines/template_url_service.cc
@@ -1642,8 +1642,8 @@ bool TemplateURLService::CanAddAutogeneratedKeywordForHost(
 }
 
 bool TemplateURLService::CanReplace(const TemplateURL* t_url) {
-  return (t_url != default_search_provider_ && !t_url->show_in_default_list() &&
-          t_url->safe_for_autoreplace());
+  return (t_url != default_search_provider_ && t_url->prepopulate_id() <= 0 &&
+          !t_url->created_by_policy() && t_url->safe_for_autoreplace());
 }
 
 TemplateURL* TemplateURLService::FindNonExtensionTemplateURLForKeyword(
@@ -2114,7 +2114,6 @@ bool TemplateURLService::ResetTemplateURLNoNotify(
 void TemplateURLService::NotifyObservers() {
   if (!loaded_)
     return;
-
   FOR_EACH_OBSERVER(TemplateURLServiceObserver, model_observers_,
                     OnTemplateURLServiceChanged());
 }