Decrease message severity to Info for downgrading metrics reporting.

The metrics reporting policy is automatically downgraded to "recommended" level due to privacy reasons. This change modifies the corresponding policy table message from type Error to type to Info, as it is an informative message to make admins aware of the automatic downgrade.

Bug: 1155602
Change-Id: Iebd13bb2d6363cf40daa792f2dcdbe0a023eff33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643061Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Igor Ruvinov <igorruvinov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846159}

components/policy/core/common/policy_service_impl.cc

@@ -166,7 +166,7 @@ void DowngradeMetricsReportingToRecommendedPolicy(PolicyMap* policies) {
   if (policy && policy->level != POLICY_LEVEL_RECOMMENDED && policy->value() &&
       policy->value()->is_bool() && policy->value()->GetBool()) {
     policy->level = POLICY_LEVEL_RECOMMENDED;
-    policy->AddMessage(PolicyMap::MessageType::kError,
+    policy->AddMessage(PolicyMap::MessageType::kInfo,
                        IDS_POLICY_IGNORED_MANDATORY_REPORTING_POLICY);
   }
 }