Add Yandex referral ID to search URL.

components/search_engines/search_terms_data.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/search_engines/search_terms_data.h"
 
 #include "base/logging.h"
 #include "components/google/core/browser/google_url_tracker.h"
 #include "url/gurl.h"
 
@@ skipping 48 matching lines @@
 }
 
 std::string SearchTermsData::ForceInstantResultsParam(
     bool for_prerender) const {
   return std::string();
 }
 
 std::string SearchTermsData::GoogleImageSearchSource() const {
   return std::string();
 }
+
+std::string SearchTermsData::GetYandexReferralID() const {
+  return std::string();
+}