Remove listener_ from AutocompleteProvider base class

chrome/browser/autocomplete/history_url_provider.h

Index: chrome/browser/autocomplete/history_url_provider.h
diff --git a/chrome/browser/autocomplete/history_url_provider.h b/chrome/browser/autocomplete/history_url_provider.h
index 23d8650495105bdffa4c26503ba760deab701c86..dc0452b1d9f91fd57499ebc610d63a913a26143f 100644
--- a/chrome/browser/autocomplete/history_url_provider.h
+++ b/chrome/browser/autocomplete/history_url_provider.h
@@ -16,6 +16,7 @@
 #include "components/history/core/browser/history_match.h"
 #include "components/search_engines/template_url.h"
 
+class AutocompleteProviderListener;
 class Profile;
 class SearchTermsData;
 
@@ -322,6 +323,8 @@ class HistoryURLProvider : public HistoryProvider {
       MatchType match_type,
       int relevance);
 
+  AutocompleteProviderListener* listener_;
+
   // Params for the current query.  The provider should not free this directly;
   // instead, it is passed as a parameter through the history backend, and the
   // parameter itself is freed once it's no longer needed.  The only reason we