Update Chomium's build files to work w/ latest GN binaries.

components/policy/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/features.gni")
 import("//third_party/protobuf/proto_library.gni")
 import("//tools/grit/grit_rule.gni")
 
 if (is_component_build) {
   component("policy_component") {
@@ skipping 71 matching lines @@
     outputs = [
       constants_header_path,
       constants_source_path,
       protobuf_decoder_path,
       chrome_settings_proto_path,
       cloud_policy_proto_path,
       app_restrictions_path,
       app_resources_path,
     ]
 
-    if (os != "android") {
+    if (current_os != "android") {
       outputs -= [
         app_restrictions_path,
         app_resources_path,
       ]
     }
 
     args = [
       "--policy-constants-header=" +
           rebase_path(constants_header_path, root_build_dir),
       "--policy-constants-source=" +
           rebase_path(constants_source_path, root_build_dir),
       "--chrome-settings-protobuf=" +
           rebase_path(chrome_settings_proto_path, root_build_dir),
       "--cloud-policy-protobuf=" +
           rebase_path(cloud_policy_proto_path, root_build_dir),
       "--cloud-policy-decoder=" +
           rebase_path(protobuf_decoder_path, root_build_dir),
       "--app-restrictions-definition=" +
           rebase_path(app_restrictions_path, root_build_dir),
       "--app-restrictions-resources=" +
           rebase_path(app_resources_path, root_build_dir),
-      os,
+      current_os,
       chromeos_flag,
       rebase_path("resources/policy_templates.json", root_build_dir),
     ]
   }
 
   proto_library("cloud_policy_proto_generated_compile") {
     sources = [
       cloud_policy_proto_path,
     ]
 
@@ skipping 87 matching lines @@
     deps = [
       ":policy_component",
       ":test_support",
       "//components/policy/proto",
       "//testing/gmock",
       "//testing/gtest",
     ]
   }
 }
 #TODO(GYP) policy templates, chrome_manifest_bundle