Copy some x509_certificate_model_nss functions to src/chromeos (reland)

chromeos/BUILD.gn

 # Copyright 2014 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/ui.gni")
 import("//testing/test.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 assert(is_chromeos, "Non-ChromeOS builds must not depend on //chromeos")
 
@@ skipping 290 matching lines @@
     "login/auth/test_attempt_state.cc",
     "login/auth/test_attempt_state.h",
     "login/auth/user_context.cc",
     "login/auth/user_context.h",
     "login/login_state.cc",
     "login/login_state.h",
     "login_event_recorder.cc",
     "login_event_recorder.h",
     "network/auto_connect_handler.cc",
     "network/auto_connect_handler.h",
+    "network/certificate_helper.cc",
+    "network/certificate_helper.h",
     "network/certificate_pattern.cc",
     "network/certificate_pattern.h",
     "network/client_cert_resolver.cc",
     "network/client_cert_resolver.h",
     "network/client_cert_util.cc",
     "network/client_cert_util.h",
     "network/device_state.cc",
     "network/device_state.h",
     "network/dhcp_proxy_script_fetcher_chromeos.cc",
     "network/dhcp_proxy_script_fetcher_chromeos.h",
@@ skipping 333 matching lines @@
     "dbus/shill_manager_client_unittest.cc",
     "dbus/shill_profile_client_unittest.cc",
     "dbus/shill_service_client_unittest.cc",
     "dbus/shill_third_party_vpn_driver_client_unittest.cc",
     "disks/disk_mount_manager_unittest.cc",
     "disks/suspend_unmount_manager_unittest.cc",
     "geolocation/simple_geolocation_unittest.cc",
     "login/auth/key_unittest.cc",
     "login/login_state_unittest.cc",
     "network/auto_connect_handler_unittest.cc",
+    "network/certificate_helper_unittest.cc",
     "network/client_cert_resolver_unittest.cc",
     "network/firewall_hole_unittest.cc",
     "network/geolocation_handler_unittest.cc",
     "network/host_resolver_impl_chromeos_unittest.cc",
     "network/managed_network_configuration_handler_unittest.cc",
     "network/network_cert_migrator_unittest.cc",
     "network/network_change_notifier_chromeos_unittest.cc",
     "network/network_configuration_handler_unittest.cc",
     "network/network_connect_unittest.cc",
     "network/network_connection_handler_impl_unittest.cc",
@@ skipping 101 matching lines @@
   proto_out_dir = "chromeos/dbus/biod"
 }
 
 proto_library("media_perception_proto") {
   sources = [
     "dbus/proto/media_perception.proto",
   ]
 
   proto_out_dir = "chromeos/media_perception"
 }