Drop 64 character limit in DeviceManagementRequest |agent| parameter

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 307 matching lines @@
 
   // If new_public_key is specified, this field contains a signature
   // of a PolicyPublicKeyAndDomain protobuf, signed using a key only
   // available to DMServer. The public key portion of this well-known key is
   // embedded into the Chrome binary. The hash of that embedded key is passed
   // to DMServer as verification_key_hash field in PolicyFetchRequest. DMServer
   // will pick a private key on the server which matches the hash (matches
   // public key on the client). If DMServer is unable to find matching key, it
   // will return an error instead of policy data.
   // In case hash was not specified, DMServer will leave verification signature
-  // field empty (legacy behavior).  
+  // field empty (legacy behavior).
   // In addition to the checks between new_public_key
   // and new_public_key_signature described above, Chrome also verifies
-  // new_public_key with the embedded public key and 
+  // new_public_key with the embedded public key and
   // new_public_key_verification_signature.
   optional bytes new_public_key_verification_signature = 7;
 }
 
 // Protobuf used to generate the new_public_key_verification_signature field.
 message PolicyPublicKeyAndDomain {
   // The public key to sign (taken from the |new_public_key| field in
   // PolicyFetchResponse).
   optional bytes new_public_key = 1;
 
@@ skipping 294 matching lines @@
 //     * ping
 //     * policy
 //     * register
 //     * status
 //     * unregister
 //     * api_authorization
 //
 //   * devicetype: MUST BE "1" for Android or "2" for Chrome OS.
 //   * apptype: MUST BE Android or Chrome.
 //   * deviceid: MUST BE no more than 64-char in [\x21-\x7E].
-//   * agent: MUST BE no more than 64-char long.
+//   * agent: MUST BE a string of characters.
 // * HTTP Authorization header MUST be in the following formats:
 //   * For register and ping requests
 //     Authorization: GoogleLogin auth=<auth cookie for Mobile Sync>
 //
 //   * For unregister, policy, status, and cert_upload requests
 //      Authorization: GoogleDMToken token=<dm token from register>
 //
 //   * The Authorization header isn't used for enterprise_check
 //     request, nor for register requests using OAuth. In the latter case,
 //     the OAuth token is passed in the "oauth" parameter.
@@ skipping 81 matching lines @@
 
   // EMCert upload response.
   optional DeviceCertUploadResponse cert_upload_response = 9;
 
   // Response to OAuth2 authorization code request.
   optional DeviceServiceApiAccessResponse service_api_access_response = 10;
 
   // Device-state retrieval.
   optional DeviceStateRetrievalResponse device_state_retrieval_response = 11;
 }