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 169 matching lines @@
 }
 
 // Response from server to API access request.
 message DeviceServiceApiAccessResponse {
   // The OAuth2 authorization code for the requested scope(s).
   // This can be exchanged for a refresh token.
   optional string auth_code = 1;
 }
 
 message PolicyFetchRequest {
+  reserved 5, 10;

[Thiemo Nagel, 2017/05/24 09:17:42]

Hey Pavol, I've just realized that the "10" actually needs to go into
PolicyData.  Could you please fix?

[pmarko, 2017/05/24 09:42:11]

Good catch. Fix CL up:
https://chromium-review.googlesource.com/c/514082/

+
   // This is the policy type, which maps to D3 policy type internally.
   // By convention, we use "/" as separator to create policy namespace.
   // The policy type names are case insensitive.
   //
   // Possible values for Chrome OS are:
   //   google/chromeos/device => ChromeDeviceSettingsProto
   //   google/chromeos/user => ChromeSettingsProto
   //   google/chromeos/publicaccount => ChromeSettingsProto
   //   google/chrome/extension => ExternalPolicyData
   //   google/chromeos/signinextension => ExternalPolicyData
@@ skipping 13 matching lines @@
   }
   optional SignatureType signature_type = 3 [default = NONE];
 
   // The version number of the public key that is currently stored
   // 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;
-
   // 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 95 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;
-
   // 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
   // service. This value is combined with invalidation_name to form the object
@@ skipping 1053 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;
 }