Limit the number of history urls indexed for omnibox suggestions.

components/history/core/browser/url_database.cc

Index: components/history/core/browser/url_database.cc
diff --git a/components/history/core/browser/url_database.cc b/components/history/core/browser/url_database.cc
index 248ecf47d865bd0944aad9a375fd9fa7f433977e..3650382c6fe2a86a6a090fff8382cd9a09ef5be7 100644
--- a/components/history/core/browser/url_database.cc
+++ b/components/history/core/browser/url_database.cc
@@ -248,6 +248,9 @@ bool URLDatabase::InitURLEnumeratorForSignificant(URLEnumerator* enumerator) {
   sql.append(kURLRowFields);
   sql.append(" FROM urls WHERE last_visit_time >= ? OR visit_count >= ? OR "
              "typed_count >= ?");
+  sql.append(
+      " ORDER BY typed_count DESC, last_visit_time DESC, visit_count "
+      "DESC");
   enumerator->statement_.Assign(GetDB().GetUniqueStatement(sql.c_str()));
   enumerator->statement_.BindInt64(
       0, AutocompleteAgeThreshold().ToInternalValue());