net: Update the include paths of base/string_piece.h to its new location.

net/cert/crl_set.h

 // Copyright (c) 2012 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_CRL_SET_H_
 #define NET_CERT_CRL_SET_H_
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace net {
 
 // A CRLSet is a structure that lists the serial numbers of revoked
 // certificates from a number of issuers where issuers are identified by the
@@ skipping 84 matching lines @@
   // to identify a CRL by index.
   std::map<std::string, size_t> crls_index_by_issuer_;
   // blocked_spkis_ contains the SHA256 hashes of SPKIs which are to be blocked
   // no matter where in a certificate chain they might appear.
   std::vector<std::string> blocked_spkis_;
 };
 
 }  // namespace net
 
 #endif  // NET_CERT_CRL_SET_H_