Revert of Don't use RSAPrivateKey in NSS integration code.

components/ownership/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/crypto.gni")
 import("//build/config/features.gni")
 
 component("ownership") {
   sources = [
     "mock_owner_key_util.cc",
     "mock_owner_key_util.h",
     "owner_key_util.cc",
     "owner_key_util.h",
     "owner_key_util_impl.cc",
     "owner_key_util_impl.h",
     "owner_settings_service.cc",
     "owner_settings_service.h",
   ]
 
   defines = [ "OWNERSHIP_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//components/keyed_service/core",
     "//components/policy/proto",
     "//components/policy:policy_component_common",
     "//crypto",
   ]
 
   if (enable_configuration_policy) {
     deps += [ "//components/policy" ]
   }
-
-  if (use_nss_certs) {
-    deps += [ "//crypto:platform" ]
-  }
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "owner_key_util_impl_unittest.cc",
   ]
 
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   deps = [
     ":ownership",
     "//testing/gtest",
   ]
 }