Apply sensible policies when computer is under MDM management

Bug: 1096839
Change-Id: I1ddad7fed38cb44d0df4aa48b99ec2fe5ed50c4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288271Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Yann Dago <ydago@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786799}

components/policy/core/common/policy_loader_win.cc

@@ -73,11 +73,8 @@ enum DomainCheckErrors {
 // Encapsulates logic to determine if enterprise policies should be honored.
 bool ShouldHonorPolicies() {
   auto& platform_management_service = PlatformManagementService::GetInstance();
-  auto management_authorities =
-      platform_management_service.GetManagementAuthorities();
-  return management_authorities.find(
-             policy::EnterpriseManagementAuthority::DOMAIN_LOCAL) !=
-         management_authorities.end();
+  return platform_management_service.GetManagementAuthorityTrustworthiness() >=
+         ManagementAuthorityTrustworthiness::TRUSTED;
 }
 
 // Parses |gpo_dict| according to |schema| and writes the resulting policy