Change ShouldShowNoticeAboutOtherFormsOfBrowsingHistory to be asynchronous.

components/browsing_data_ui/history_notice_utils.h

Index: components/browsing_data_ui/history_notice_utils.h
diff --git a/components/browsing_data_ui/history_notice_utils.h b/components/browsing_data_ui/history_notice_utils.h
index a960e69a697ebe768d8cc7859bb6b6e6591c33fa..750800f627abb51a62f763adbfc87761016e164d 100644
--- a/components/browsing_data_ui/history_notice_utils.h
+++ b/components/browsing_data_ui/history_notice_utils.h
@@ -5,6 +5,7 @@
 #ifndef COMPONENTS_BROWSING_DATA_UI_HISTORY_NOTICE_UTILS_H_
 #define COMPONENTS_BROWSING_DATA_UI_HISTORY_NOTICE_UTILS_H_
 
+class Callback;
 class ProfileSyncService;
 
 namespace history {
@@ -14,10 +15,12 @@ class WebHistoryService;
 namespace browsing_data_ui {
 
 // Whether the Clear Browsing Data UI should show a notice about the existence
-// of other forms of browsing history stored in user's account.
-bool ShouldShowNoticeAboutOtherFormsOfBrowsingHistory(
+// of other forms of browsing history stored in user's account. The response
+// is returned in a |callback|.
+void ShouldShowNoticeAboutOtherFormsOfBrowsingHistory(
     const ProfileSyncService* sync_service,
-    const history::WebHistoryService* history_service);
+    const history::WebHistoryService* history_service,
+    base::Callback<void(bool)> callback);
 
 }  // namespace browsing_data_ui