Make some code gender neutral.

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

Index: chrome/browser/chromeos/policy/proto/chrome_device_policy.proto
diff --git a/chrome/browser/chromeos/policy/proto/chrome_device_policy.proto b/chrome/browser/chromeos/policy/proto/chrome_device_policy.proto
index 58134cbc0382a8971ca1c4a4e47529e0cbcebcae..3789e5f13827c62a47ef22d7de6ab578c489d9ad 100644
--- a/chrome/browser/chromeos/policy/proto/chrome_device_policy.proto
+++ b/chrome/browser/chromeos/policy/proto/chrome_device_policy.proto
@@ -662,7 +662,7 @@ message LoginScreenDomainAutoCompleteProto {
   // 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;
 }