Data from the autocomplete predictor wasn't deleted immediately when deleting browsing history.

chrome/browser/predictors/autocomplete_action_predictor.h

Index: chrome/browser/predictors/autocomplete_action_predictor.h
diff --git a/chrome/browser/predictors/autocomplete_action_predictor.h b/chrome/browser/predictors/autocomplete_action_predictor.h
index e2df03d359f18d7bdf71b47fc473657e35d2fc59..9fcb00138652c2281a3a0833742c9b3dab47d270 100644
--- a/chrome/browser/predictors/autocomplete_action_predictor.h
+++ b/chrome/browser/predictors/autocomplete_action_predictor.h
@@ -187,8 +187,8 @@ class AutocompleteActionPredictor
       std::vector<AutocompleteActionPredictorTable::Row>* row_buffer);
 
   // Attempts to call DeleteOldEntries if the in-memory database has been loaded
-  // by |service|. Returns success as a boolean.
-  bool TryDeleteOldEntries(history::HistoryService* service);
+  // by |service|.
+  void TryDeleteOldEntries(history::HistoryService* service);
 
   // Called to delete any old or invalid entries from the database. Called after
   // the local caches are created once the history service is available.