Make GN build work on Mac again.

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")
 
 if (is_android) {
@@ skipping 21 matching lines @@
 posix_avoid_mmap = is_android && cpu_arch != "x86"
 
 # WebSockets and socket stream code are used everywhere except iOS.
 enable_websockets = !is_ios
 # TODO(brettw) put back to "!is_ios" when v8 is supported in GN build.
 use_v8_in_net = false  # TODO(brettw)!is_ios
 enable_built_in_dns = !is_ios
 
 enable_ftp_support = !is_ios
 
-# When OpenSSL is used for SSL and crypto on Unix-like systems, use OpenSSL"s
-# certificate definition.
-use_openssl_certs = (is_linux || is_android) && use_openssl
-
 config("net_config") {
   defines = []
   if (posix_avoid_mmap) {
     defines += [ "POSIX_AVOID_MMAP" ]
   }
 }
 
 # Disables Windows warning about size to int truncations.
 # TODO(jschuh): crbug.com/167187 fix this and delete this config.
 config("net_win_size_truncation") {
@@ skipping 218 matching lines @@
       "ocsp/nss_ocsp.h",
       "third_party/mozilla_security_manager/nsKeygenHandler.cpp",
       "third_party/mozilla_security_manager/nsKeygenHandler.h",
       "third_party/mozilla_security_manager/nsNSSCertificateDB.cpp",
       "third_party/mozilla_security_manager/nsNSSCertificateDB.h",
       "third_party/mozilla_security_manager/nsPKCS12Blob.cpp",
       "third_party/mozilla_security_manager/nsPKCS12Blob.h",
     ]
   }
 
-  if (use_openssl) {
+  if (!use_nss_certs) {

[Ryan Sleevi, 2014/04/18 00:25:07]

FYI -
https://code.google.com/p/chromium/codesearch#chromium/src/net/net.gyp&l=449

     sources -= [
       "cert/cert_verify_proc_nss.cc",
       "cert/cert_verify_proc_nss.h",
       "ssl/client_cert_store_nss.cc",
       "ssl/client_cert_store_nss.h",
     ]
     if (is_chromeos) {
       # These were already removed on non-ChromeOS.
       sources -= [
         "ssl/client_cert_store_chromeos.cc",
@@ skipping 609 matching lines @@
 
 if (is_android || is_linux) {
   executable("disk_cache_memory_test") {
     sources = [ "tools/disk_cache_memory_test/disk_cache_memory_test.cc" ]
     deps = [
       ":net",
       "//base",
     ]
   }
 }