Add libxslt to the GN build

net/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//tools/grit/grit_rule.gni")
 import("//url/config.gni")
 
@@ skipping 1068 matching lines @@
       # sense.
       "dns/dns_config_service_posix_unittest.cc",
     ]
     deps += [
       ":net_javatests",  # FIXME(brettw)
       ":net_test_jni_headers",
     ]
   }
 
   if (!use_nss_certs) {
-    sources -= [
-      "ssl/client_cert_store_nss_unittest.cc",
-      "ssl/client_cert_store_chromeos_unittest.cc",
-    ]
+    sources -= [ "ssl/client_cert_store_nss_unittest.cc" ]
+    if (is_chromeos) {
+      # Will have already have been removed in the ChromeOS case.
+      sources -= [ "ssl/client_cert_store_chromeos_unittest.cc" ]
+    }
   }
 
   if (use_openssl) {
     # When building for OpenSSL, we need to exclude NSS specific tests
     # or functionality not supported by OpenSSL yet.
     # TODO(bulach): Add equivalent tests when the underlying
     #               functionality is ported to OpenSSL.
     sources -= [
       "cert/ct_objects_extractor_unittest.cc",
       "cert/multi_log_ct_verifier_unittest.cc",
@@ skipping 180 matching lines @@
   if (use_icu_alternatives_on_android) {
     sources -= [
       "base/filename_util_unittest.cc",
       "base/net_util_icu_unittest.cc",
     ]
     deps -= [ "//base:i18n" ]
   }
 }
 
 }  # !is_android