Remove uses of std::unary_function and std::binary_function.

components/omnibox/browser/url_index_private_data.h

Index: components/omnibox/browser/url_index_private_data.h
diff --git a/components/omnibox/browser/url_index_private_data.h b/components/omnibox/browser/url_index_private_data.h
index a7348cca5d73db11d34860c11cbebf75327b42fb..0a327e5b24c9eb782164fc9312908bd069eebfe3 100644
--- a/components/omnibox/browser/url_index_private_data.h
+++ b/components/omnibox/browser/url_index_private_data.h
@@ -198,7 +198,7 @@ class URLIndexPrivateData
 
   // A helper class which performs the final filter on each candidate
   // history URL match, inserting accepted matches into |scored_matches_|.
-  class AddHistoryMatch : public std::unary_function<HistoryID, void> {
+  class AddHistoryMatch {
    public:
     AddHistoryMatch(bookmarks::BookmarkModel* bookmark_model,
                     TemplateURLService* template_url_service,
@@ -230,8 +230,7 @@ class URLIndexPrivateData
 
   // A helper predicate class used to filter excess history items when the
   // candidate results set is too large.
-  class HistoryItemFactorGreater
-      : public std::binary_function<HistoryID, HistoryID, void> {
+  class HistoryItemFactorGreater {
    public:
     explicit HistoryItemFactorGreater(const HistoryInfoMap& history_info_map);
     ~HistoryItemFactorGreater();