[MD History] Fix deletion in heavily scrolled list.

chrome/browser/ui/webui/browsing_history_handler.h

Index: chrome/browser/ui/webui/browsing_history_handler.h
diff --git a/chrome/browser/ui/webui/browsing_history_handler.h b/chrome/browser/ui/webui/browsing_history_handler.h
index 2ad459a0d770fe49e45613b29868ee1d8fae8965..62d4b75e8b5d02ff4212be4c60b01f01ea217d67 100644
--- a/chrome/browser/ui/webui/browsing_history_handler.h
+++ b/chrome/browser/ui/webui/browsing_history_handler.h
@@ -150,6 +150,9 @@ class BrowsingHistoryHandler : public content::WebUIMessageHandler,
                      history::QueryResults* results);
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(BrowsingHistoryHandlerTest,
+                           ObservingWebHistoryDeletions);
+
   // The range for which to return results:
   // - ALLTIME: allows access to all the results in a paginated way.
   // - WEEK: the last 7 days.