Merge LogDnsClient's QueryLeafIndex and QueryAuditProof methods

components/certificate_transparency/mock_log_dns_traffic.cc

Index: components/certificate_transparency/mock_log_dns_traffic.cc
diff --git a/components/certificate_transparency/mock_log_dns_traffic.cc b/components/certificate_transparency/mock_log_dns_traffic.cc
index 47922c05b2a9bdb0aa519bcb0891365720f109ae..9afcc9f506c0bbaaec8184d92506ca3377e81513 100644
--- a/components/certificate_transparency/mock_log_dns_traffic.cc
+++ b/components/certificate_transparency/mock_log_dns_traffic.cc
@@ -7,10 +7,11 @@
 #include <algorithm>
 #include <numeric>
 #include <vector>
 
 #include "base/big_endian.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/sys_byteorder.h"
 #include "base/test/test_timeouts.h"
 #include "net/dns/dns_client.h"
 #include "net/dns/dns_protocol.h"
 #include "net/dns/dns_util.h"
@@ -202,10 +203,16 @@ void MockLogDnsTraffic::ExpectLeafIndexRequestAndResponse(
   answer.insert(answer.begin(), static_cast<char>(leaf_index.size()));
 
   ExpectRequestAndResponse(qname, answer);
 }
 
+void MockLogDnsTraffic::ExpectLeafIndexRequestAndResponse(
+    base::StringPiece qname,
+    uint64_t leaf_index) {
+  ExpectLeafIndexRequestAndResponse(qname, base::Uint64ToString(leaf_index));
+}
+
 void MockLogDnsTraffic::ExpectAuditProofRequestAndResponse(
     base::StringPiece qname,
     std::vector<std::string>::const_iterator audit_path_start,
     std::vector<std::string>::const_iterator audit_path_end) {
   // Join nodes in the audit path into a single string.