Make some code gender neutral.

chrome/browser/chromeos/policy/proto/chrome_device_policy.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 644 matching lines @@
   // Specifies the maximum extension cache size, in bytes. The default is 256
   // MiB. The minimum allowed value is 1 MiB, smaller values will get ignored.
   optional int64 extension_cache_size = 1;
 }
 
 message LoginScreenDomainAutoCompleteProto {
   // If this policy is not configured or set to a blank string,
   // no autocomplete option during user sign-in flow will be shown.
   // If this policy is set to a string representing a domain name, an
   // autocomplete option during user sign-in will be shown allowing the user
-  // to type in only his user name without the domain name extension. The user
+  // to type in only their user name without the domain name extension. The user
   // will be able to overwrite this domain name extension.
   optional string login_screen_domain_auto_complete = 1;
 }
 
 // Settings that control whether a device would send system logs to the server.
 message DeviceLogUploadSettingsProto {
   // Whether the device should send system logs. The default is false.
   optional bool system_log_upload_enabled = 1 [default = false];
 }
 
@@ skipping 117 matching lines @@
   optional AllowKioskAppControlChromeVersionProto
       allow_kiosk_app_control_chrome_version = 40;
   optional LoginAuthenticationBehaviorProto login_authentication_behavior = 41;
   optional UsbDetachableWhitelistProto usb_detachable_whitelist = 42;
   optional AllowBluetoothProto allow_bluetooth = 43;
   optional DeviceQuirksDownloadEnabledProto quirks_download_enabled = 44;
   optional LoginVideoCaptureAllowedUrlsProto login_video_capture_allowed_urls =
       45;
   optional LoginAppsProto login_apps = 46;
 }