Delete some unused code found by -Wunused-function

net/base/x509_util_nss_unittest.cc

Index: net/base/x509_util_nss_unittest.cc
diff --git a/net/base/x509_util_nss_unittest.cc b/net/base/x509_util_nss_unittest.cc
index be719d79483807e748fb0ffd779015448ad68a59..e6c017589dc946d932811bf03b18b6c16dd2fd1d 100644
--- a/net/base/x509_util_nss_unittest.cc
+++ b/net/base/x509_util_nss_unittest.cc
@@ -31,6 +31,7 @@ CERTCertificate* CreateNSSCertHandleFromBytes(const char* data, size_t length) {
                                  PR_FALSE, PR_TRUE);
 }
 
+#if !defined(OS_WIN) && !defined(OS_MACOSX)
 void VerifyCertificateSignature(const std::string& der_cert,
                                 const std::vector<uint8>& der_spki) {
   crypto::ScopedPLArenaPool arena(PORT_NewArena(DER_DEFAULT_CHUNKSIZE));
@@ -73,6 +74,7 @@ void VerifyCertificateSignature(const std::string& der_cert,
   ok = verifier.VerifyFinal();
   EXPECT_TRUE(ok);
 }
+#endif  // !defined(OS_WIN) && !defined(OS_MACOSX)
 
 void VerifyDomainBoundCert(const std::string& domain,
                            const std::string& der_cert) {