Clean up error message in schema-based policy validation

components/policy/core/common/schema_map.cc

Index: components/policy/core/common/schema_map.cc
diff --git a/components/policy/core/common/schema_map.cc b/components/policy/core/common/schema_map.cc
index 90d62c56e4f4d4fde43f013c6c48359e1568675a..dd2a3294e4bc645d7133725c2fbc641651b0e897 100644
--- a/components/policy/core/common/schema_map.cc
+++ b/components/policy/core/common/schema_map.cc
@@ -70,10 +70,10 @@ void SchemaMap::FilterBundle(PolicyBundle* bundle) const {
                                   SCHEMA_STRICT,
                                   &error_path,
                                   &error)) {
-        LOG(ERROR) << "Dropping policy " << policy_name << " for "
-                   << it->first.component_id
-                   << " because it's not valid: " << error
-                   << " at " << error_path;
+        LOG(ERROR) << "Dropping policy " << policy_name << " of component "
+                   << it->first.component_id << " due to error at "
+                   << (error_path.empty() ? "root" : error_path) << ": "
+                   << error;
         map->Erase(policy_name);
       }
     }