Optimize CT & OCSP handling code

net/cert/ct_signed_certificate_timestamp_log_param.h

 // Copyright 2013 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.
 
 #ifndef NET_CERT_CT_SIGNED_CERTIFICATE_TIMESTAMP_LOG_PARAM_H_
 #define NET_CERT_CT_SIGNED_CERTIFICATE_TIMESTAMP_LOG_PARAM_H_
 
 #include <memory>
-#include <string>
 
+#include "base/strings/string_piece.h"
 #include "net/cert/signed_certificate_timestamp_and_status.h"
 
 namespace base {
 class Value;
 }
 
 namespace net {
 
 class NetLogCaptureMode;
 
 // Creates a dictionary of processed Signed Certificate Timestamps to be
 // logged in the NetLog.
 // See the documentation for SIGNED_CERTIFICATE_TIMESTAMPS_CHECKED
 // in net/log/net_log_event_type_list.h
 std::unique_ptr<base::Value> NetLogSignedCertificateTimestampCallback(
     const SignedCertificateTimestampAndStatusList* scts,
     NetLogCaptureMode capture_mode);
 
 // Creates a dictionary of raw Signed Certificate Timestamps to be logged
 // in the NetLog.
 // See the documentation for SIGNED_CERTIFICATE_TIMESTAMPS_RECEIVED
 // in net/log/net_log_event_type_list.h
 std::unique_ptr<base::Value> NetLogRawSignedCertificateTimestampCallback(
-    const std::string* embedded_scts,
-    const std::string* sct_list_from_ocsp,
-    const std::string* sct_list_from_tls_extension,
+    base::StringPiece embedded_scts,
+    base::StringPiece sct_list_from_ocsp,
+    base::StringPiece sct_list_from_tls_extension,
     NetLogCaptureMode capture_mode);
 
 }  // namespace net
 
 #endif  // NET_CERT_CT_SIGNED_CERTIFICATE_TIMESTAMP_LOG_PARAM_H_