Rename USE_NSS to USE_NSS_CERTS.

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("//build/module_args/v8.gni")
 import("//url/config.gni")
 import("//testing/test.gni")
@@ skipping 443 matching lines @@
     libs = [
       "Foundation.framework",
       "Security.framework",
       "SystemConfiguration.framework",
       "resolv",
     ]
   }
 
   if (is_ios) {
     # Add back some sources that were otherwise filtered out. iOS additionally
-    # doesn't set USE_NSS but needs some of the files.
+    # doesn't set USE_NSS_CERTS but needs some of the files.
     set_sources_assignment_filter([])
     sources += [
       "base/net_util_mac.cc",
       "base/net_util_mac.h",
       "base/network_change_notifier_mac.cc",
       "base/network_config_watcher_mac.cc",
       "base/platform_mime_util_mac.mm",
       "cert/cert_verify_proc_nss.cc",
       "cert/cert_verify_proc_nss.h",
       "cert/test_root_certs_nss.cc",
@@ skipping 1174 matching lines @@
   } else {
     sources -= [ "proxy/proxy_resolver_perftest.cc" ]
   }
 
   if (is_win && icu_use_data_file) {
     # This is needed to trigger the dll copy step on windows.
     # TODO(mark): Specifying this here shouldn't be necessary.
     deps += [ "//third_party/icu:icudata" ]
   }
 }