Make *some* version of the Mac GN build work.

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("//url/config.gni")
 
 # TODO(cjhopman): //build/config/android/rules.gni also imports grit_rule.gni.
@@ skipping 1043 matching lines @@
     sources = [ "tools/disk_cache_memory_test/disk_cache_memory_test.cc" ]
     deps = [
       ":net",
       "//base",
     ]
   }
 }
 
 # TODO(GYP) make this compile on Android, we need some native test deps done.
 # TODO(GYP) Also doesn't work on Windows; dependency on boringssl is wrong.
-if (!is_android && !is_win) {
+# TODO(GYP) Also doesn't work on Mac, need to figure out why not.
+if (!is_android && !is_win && !is_mac) {
 
 source_set("quic_tools") {
   sources = [
     "quic/quic_dispatcher.cc",
     "quic/quic_dispatcher.h",
     "quic/quic_in_memory_cache.cc",
     "quic/quic_in_memory_cache.h",
     "quic/quic_per_connection_packet_writer.cc",
     "quic/quic_per_connection_packet_writer.h",
     "quic/quic_server.cc",
@@ skipping 281 matching lines @@
 executable("quic_server") {
   sources = [ "quic/quic_server_bin.cc" ]
   deps = [
     ":quic_tools",
     ":net",
     "//base",
     "//third_party/boringssl",
   ]
 }
 
-}  # !is_android
+}  # !is_android && !is_win && !is_mac