Clean up error message in schema-based policy validation

components/policy/core/common/schema_map.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/policy/core/common/schema_map.h"
 
 #include "base/logging.h"
 #include "base/values.h"
 #include "components/policy/core/common/policy_bundle.h"
 #include "components/policy/core/common/policy_map.h"
@@ skipping 52 matching lines @@
       const base::Value* policy_value = it_map->second.value.get();
       Schema policy_schema = schema->GetProperty(policy_name);
       ++it_map;
       std::string error_path;
       std::string error;
       if (!policy_value ||
           !policy_schema.Validate(*policy_value,
                                   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);
       }
     }
   }
 }
 
 bool SchemaMap::HasComponents() const {
   for (DomainMap::const_iterator domain = map_.begin();
        domain != map_.end(); ++domain) {
     if (domain->first == POLICY_DOMAIN_CHROME)
@@ skipping 20 matching lines @@
     for (ComponentMap::const_iterator comp = components.begin();
          comp != components.end(); ++comp) {
       PolicyNamespace ns(domain->first, comp->first);
       if (!other->GetSchema(ns))
         list->push_back(ns);
     }
   }
 }
 
 }  // namespace policy