Add a testing switch to override the query for other forms of browsing history

components/browsing_data_ui/history_notice_utils.cc

Index: components/browsing_data_ui/history_notice_utils.cc
diff --git a/components/browsing_data_ui/history_notice_utils.cc b/components/browsing_data_ui/history_notice_utils.cc
index c651520c80b4ca7151bb3082d255392d4c311c6a..1116c3f283caf34a7b0152915b347d549462d6d7 100644
--- a/components/browsing_data_ui/history_notice_utils.cc
+++ b/components/browsing_data_ui/history_notice_utils.cc
@@ -10,6 +10,12 @@
 
 namespace browsing_data_ui {
 
+namespace testing {
+
+bool g_override_other_forms_of_browsing_history_query = false;
+
+}
+
 void ShouldShowNoticeAboutOtherFormsOfBrowsingHistory(
     const ProfileSyncService* sync_service,
     history::WebHistoryService* history_service,
@@ -18,7 +24,8 @@ void ShouldShowNoticeAboutOtherFormsOfBrowsingHistory(
       !sync_service->IsSyncActive() ||
       sync_service->IsUsingSecondaryPassphrase() ||
       !history_service ||
-      !history_service->HasOtherFormsOfBrowsingHistory()) {
+      (!testing::g_override_other_forms_of_browsing_history_query &&
+       !history_service->HasOtherFormsOfBrowsingHistory())) {
     callback.Run(false);
     return;
   }