New policy to enable/disable HTTP-based downloads.

chrome/browser/policy/proto/chromeos/chrome_device_policy.proto

 // Copyright (c) 2012 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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package enterprise_management;
 
@@ skipping 184 matching lines @@
   // The types of connections that are OK to use for OS updates. OS updates
   // potentially put heavy strain on the connection due to their size and may
   // incur additional cost. Therefore, they are by default not enabled for
   // connection types that are considered expensive, which include WiMax,
   // Bluetooth and Cellular at the moment.
   repeated ConnectionType allowed_connection_types = 5;
 
   // True if the device should reboot automatically when an update has been
   // applied and a reboot is required to complete the update process.
   optional bool reboot_after_update = 6;
+
+  // True if AU payloads can be downloaded via HTTP. False otherwise.
+  optional bool http_downloads_enabled = 7 [default = false];
 }
 
 message StartUpUrlsProto {
   // Specifies the URLs to be loaded on login to the anonymous account used if
   // the device is in RETAIL mode.
   repeated string start_up_urls = 1;
 }
 
 message SystemTimezoneProto {
   // Specifies an owner-determined timezone that applies to the login screen and
@@ skipping 134 matching lines @@
   optional StartUpUrlsProto start_up_urls = 18;
   optional PinnedAppsProto pinned_apps = 19;
   optional SystemTimezoneProto system_timezone = 20;
   optional DeviceLocalAccountsProto device_local_accounts = 21;
   optional AllowRedeemChromeOsRegistrationOffersProto allow_redeem_offers = 22;
   optional StartUpFlagsProto start_up_flags = 23;
   optional UptimeLimitProto uptime_limit = 24;
   optional VariationsParameterProto variations_parameter = 25;
   optional AttestationSettingsProto attestation_settings = 26;
 }