Add more size_t -> int warning fixes for the win x64 GN build.

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.
 
 component("ownership") {
   sources = [
     "mock_owner_key_util.cc",
     "mock_owner_key_util.h",
     "owner_key_util.cc",
     "owner_key_util.h",
@@ skipping 14 matching lines @@
     "//crypto",
   ]
 }
 
 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",
   ]
 }