Add Yandex referral ID to search URL.

components/search_engines/search_terms_data.cc

Index: components/search_engines/search_terms_data.cc
diff --git a/components/search_engines/search_terms_data.cc b/components/search_engines/search_terms_data.cc
index f0ef783c6ec7b69e17fafa4c3caf67fd24f8e7a1..9596840df4b3892372ca84eb215ce4050ac0137b 100644
--- a/components/search_engines/search_terms_data.cc
+++ b/components/search_engines/search_terms_data.cc
@@ -66,3 +66,7 @@ std::string SearchTermsData::ForceInstantResultsParam(
 std::string SearchTermsData::GoogleImageSearchSource() const {
   return std::string();
 }
+
+std::string SearchTermsData::YandexReferralID() const {
+  return std::string();
+}