Adds gn config for policy_templates.zip

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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 84 matching lines @@
   deps = []
 }
 
 # TODO(GYP_GONE): Figure out if we really need this target or if there's
 # some better way to specify things.
 if (is_win) {
   group("chrome_official_builder_no_unittests") {
     deps = [
       "//chrome/installer/gcapi",
       "//chrome/installer/mini_installer",
+      "//components/policy:pack_policy_templates",
       "//courgette",
-
-      # TODO(GYP): crbug.com/621575 do we need to port this?
-      # "//chrome:pack_policy_templates",
-
       "//remoting/webapp",
     ]
     if (target_cpu == "x86") {
       deps += [ "//courgette(//build/toolchain/win:x64)" ]
     }
     if (is_chrome_branded) {
       deps += [ "//remoting/host:remoting_host_installation" ]
     }
   }
 }
@@ skipping 893 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }