Don't build x509_certificate_model_unittest.cc on Windows and Mac.

It's only implemented and used if NSS (or later OpenSSL) provide the
certificate information. The check was checking against use_openssl rather than
use_openssl_certs.

BUG=394959

Review URL: https://codereview.chromium.org/399143005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284022 0039d316-1c4b-4281-b951-d872f2087c98

chrome/chrome_tests_unit.gypi

@@ -2737,7 +2737,7 @@
             ['exclude', '^../ui/views/'],
           ],
         }],
-        ['use_nss==0 and use_openssl==0', {
+        ['use_nss==0 and use_openssl_certs==0', {
           'sources!': [
             'common/net/x509_certificate_model_unittest.cc',
           ],