Remove the "not_after" validation of policy timestamps

components/policy/core/common/cloud/user_cloud_policy_store.cc

Index: components/policy/core/common/cloud/user_cloud_policy_store.cc
diff --git a/components/policy/core/common/cloud/user_cloud_policy_store.cc b/components/policy/core/common/cloud/user_cloud_policy_store.cc
index 9307530d63bf6014d2647a4db46561446c4f8c90..67c7a3c3fe469ea2d4c903b0758bf893f0302c3a 100644
--- a/components/policy/core/common/cloud/user_cloud_policy_store.cc
+++ b/components/policy/core/common/cloud/user_cloud_policy_store.cc
@@ -338,7 +338,7 @@ void UserCloudPolicyStore::Validate(
     const UserCloudPolicyValidator::CompletionCallback& callback) {
   // Configure the validator.
   std::unique_ptr<UserCloudPolicyValidator> validator = CreateValidator(
-      std::move(policy), CloudPolicyValidatorBase::TIMESTAMP_NOT_BEFORE);
+      std::move(policy), CloudPolicyValidatorBase::TIMESTAMP_VALIDATED);
 
   // Extract the owning domain from the signed-in user (if any is set yet).
   // If there's no owning domain, then the code just ensures that the policy