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

net/dns/dns_response.cc

Index: net/dns/dns_response.cc
diff --git a/net/dns/dns_response.cc b/net/dns/dns_response.cc
index 64db818b2b9426a73a5d4c20e2a24bec32396b2e..730206ca6080193454bb3a70dea5c8cef5667eec 100644
--- a/net/dns/dns_response.cc
+++ b/net/dns/dns_response.cc
@@ -303,7 +303,7 @@ DnsResponse::Result DnsResponse::ParseToAddressList(
       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() !=
@@ -315,7 +315,7 @@ DnsResponse::Result DnsResponse::ParseToAddressList(
       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);