Drop |languages| from {Format,Elide}Url* and IDNToUnicode

components/history/core/browser/url_database.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/history/core/browser/url_database.h"
 
 #include <limits>
 #include <string>
 #include <vector>
 
@@ skipping 352 matching lines @@
   sql::Statement statement(GetDB().GetCachedStatement(SQL_FROM_HERE,
       "SELECT" HISTORY_URL_ROW_FIELDS "FROM urls WHERE hidden = 0"));
 
   while (statement.Step()) {
     query_parser::QueryWordVector query_words;
     base::string16 url = base::i18n::ToLower(statement.ColumnString16(1));
     query_parser_.ExtractQueryWords(url, &query_words);
     GURL gurl(url);
     if (gurl.is_valid()) {
       // Decode punycode to match IDN.
-      // |query_words| won't be shown to user - therefore we can use empty
-      // |languages| to reduce dependency (no need to call PrefService).
       base::string16 ascii = base::ASCIIToUTF16(gurl.host());
-      base::string16 utf =
-          url_formatter::IDNToUnicode(gurl.host(), std::string());
+      base::string16 utf = url_formatter::IDNToUnicode(gurl.host());
       if (ascii != utf)
         query_parser_.ExtractQueryWords(utf, &query_words);
     }
     base::string16 title = base::i18n::ToLower(statement.ColumnString16(2));
     query_parser_.ExtractQueryWords(title, &query_words);
 
     if (query_parser_.DoesQueryMatch(query_words, query_nodes.get())) {
       URLResult info;
       FillURLRow(statement, &info);
       if (info.url().is_valid())
@@ skipping 240 matching lines @@
 bool RowQualifiesAsSignificant(const URLRow& row,
                                const base::Time& threshold) {
   const base::Time& real_threshold =
       threshold.is_null() ? AutocompleteAgeThreshold() : threshold;
   return (row.typed_count() >= kLowQualityMatchTypedLimit) ||
          (row.visit_count() >= kLowQualityMatchVisitLimit) ||
          (row.last_visit() >= real_threshold);
 }
 
 }  // namespace history