Optimize CT & OCSP handling code

net/cert/ct_objects_extractor.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_OBJECTS_EXTRACTOR_H_
 #define NET_CERT_CT_OBJECTS_EXTRACTOR_H_
 
 #include <string>
 
+#include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 #include "net/cert/x509_certificate.h"
 
 namespace net {
 
 namespace ct {
 
 struct LogEntry;
 
 // Extracts a SignedCertificateTimestampList that has been embedded within a
@@ skipping 27 matching lines @@
 
 // Extracts a SignedCertificateTimestampList that has been embedded within
 // an OCSP response as an extension with the OID 1.3.6.1.4.1.11129.2.4.5.
 // If the extension is present, and the response matches the issuer and
 // serial number, returns true, updating |*sct_list| to contain
 // the encoded list, minus the DER encoding necessary for the extension.
 // |*sct_list| can then be further decoded with ct::DecodeSCTList.
 NET_EXPORT_PRIVATE bool ExtractSCTListFromOCSPResponse(
     X509Certificate::OSCertHandle issuer,
     const std::string& cert_serial_number,
-    const std::string& ocsp_response,
+    base::StringPiece ocsp_response,
     std::string* sct_list);
 
 }  // namespace ct
 
 }  // namespace net
 
 #endif  // NET_CERT_CT_OBJECTS_EXTRACTOR_H_