Remove enterprise serial number recovery feature

components/policy/proto/device_management_backend.proto

 // Copyright 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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package enterprise_management;
 
@@ skipping 205 matching lines @@
   // on the client. This should be the last number the server had
   // supplied as new_public_key_version in PolicyData.
   // This field is unspecified if the client does not yet have a
   // public key.
   optional int32 public_key_version = 4;
 
   // Machine hardware id, such as serial number.
   // This field is should be set only if the serial number for the device is
   // missing from the server, as indicated by the valid_serial_number_missing
   // field in the last policy fetch response.
   optional string machine_id = 5;

[Thiemo Nagel, 2017/05/02 10:53:06]

I guess this one should be removed too?

[pmarko, 2017/05/17 16:00:21]

Yes, I missed it :) thanks. Done.

 
   // This field is used for devices to send the additional ID to fetch settings.
   // Retrieving some settings requires more than just device or user ID.
   // For example, to retrieve public account, devices need to pass in
   // public account ID in addition to device ID. To retrieve extension or
   // plug-in settings, devices need to pass in extension/plug-in ID in
   // addition to user ID.
   // policy_type represents the type of settings (e.g. public account,
   // extension) devices request to fetch.
   optional string settings_entity_id = 6;
@@ skipping 96 matching lines @@
     // Association is active and policy is pushed.
     ACTIVE = 0;
     // Association is alive, but the corresponding domain is not managed.
     UNMANAGED = 1;
     // The device has been deprovisioned by the administrator and is no longer
     // managed.
     DEPROVISIONED = 2;
   }
   optional AssociationState state = 9 [default = ACTIVE];
 
-  // Indicates if the the server cannot find a valid serial number for the
-  // device.  If this flag is set, the device should send the valid serial
-  // number with a device policy fetch request.  Note that this only
-  // applies to device policy.
-  optional bool valid_serial_number_missing = 10;
+  // OBSELETE: Serial number recovery is no longer supported.

[Thiemo Nagel, 2017/05/02 10:53:06]

We have changed our approach and now completely remove obsolete fields (but mark
their ids as reserved to avoid re-use.)

[pmarko, 2017/05/17 16:00:21]

Done.

+  optional bool OBSOLETE_valid_serial_number_missing = 10;
 
   // Indicates which public account or extension/plug-in this policy data is
   // for. See PolicyFetchRequest.settings_entity_id for more details.
   optional string settings_entity_id = 11;
 
   // Indicates the identity the device service account is associated with.
   // This is only sent as part of device policy fetch.
   optional string service_account_identity = 12;
 
   // The object source which hosts policy objects within the invalidation
@@ skipping 1116 matching lines @@
       check_android_management_response = 18;
 
   // Response to an Active Directory Play user enrollment request.
   optional ActiveDirectoryEnrollPlayUserResponse
       active_directory_enroll_play_user_response = 19;
 
   // Response to a Play activity request.
   optional ActiveDirectoryPlayActivityResponse
       active_directory_play_activity_response = 20;
 }