Replace base::str[n]casecmp with helper functions.

net/dns/dns_response.cc

 // 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.
 
 #include "net/dns/dns_response.h"
 
 #include "base/big_endian.h"
 #include "base/strings/string_util.h"
 #include "base/sys_byteorder.h"
 #include "net/base/address_list.h"
@@ skipping 285 matching lines @@
   unsigned ancount = answer_count();
   for (unsigned i = 0; i < ancount; ++i) {
     if (!parser.ReadRecord(&record))
       return DNS_MALFORMED_RESPONSE;
 
     if (record.type == dns_protocol::kTypeCNAME) {
       // Following the CNAME chain, only if no addresses seen.
       if (!ip_addresses.empty())
         return DNS_CNAME_AFTER_ADDRESS;
 
-      if (base::strcasecmp(record.name.c_str(), expected_name.c_str()) != 0)
+      if (!base::EqualsCaseInsensitiveASCII(record.name, expected_name))
         return DNS_NAME_MISMATCH;
 
       if (record.rdata.size() !=
           parser.ReadName(record.rdata.begin(), &expected_name))
         return DNS_MALFORMED_CNAME;
 
       ttl_sec = std::min(ttl_sec, record.ttl);
     } else if (record.type == expected_type) {
       if (record.rdata.size() != expected_size)
         return DNS_SIZE_MISMATCH;
 
-      if (base::strcasecmp(record.name.c_str(), expected_name.c_str()) != 0)
+      if (!base::EqualsCaseInsensitiveASCII(record.name, expected_name))
         return DNS_NAME_MISMATCH;
 
       ttl_sec = std::min(ttl_sec, record.ttl);
       ip_addresses.push_back(IPAddressNumber(record.rdata.begin(),
                                              record.rdata.end()));
     }
   }
 
   // TODO(szym): Extract TTL for NODATA results. http://crbug.com/115051
 
   // getcanonname in eglibc returns the first owner name of an A or AAAA RR.
   // If the response passed all the checks so far, then |expected_name| is it.
   *addr_list = AddressList::CreateFromIPAddressList(ip_addresses,
                                                     expected_name);
   *ttl = base::TimeDelta::FromSeconds(ttl_sec);
   return DNS_PARSE_OK;
 }
 
 }  // namespace net