policy: use JSON schema to deserialize entries from Windows registry.

components/policy/core/common/policy_schema.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/policy_schema.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "components/json_schema/json_schema_constants.h"
@@ skipping 212 matching lines @@
   }
 
   // Validate the main type.
   if (!dict->GetString(json_schema_constants::kType, &string_value) ||
       string_value != json_schema_constants::kObject) {
     *error =
         "The main schema must have a type attribute with \"object\" value.";
     return scoped_ptr<PolicySchema>();
   }
 
-  // Checks for invalid attributes at the top-level.
-  if (dict->HasKey(json_schema_constants::kAdditionalProperties) ||
-      dict->HasKey(json_schema_constants::kPatternProperties)) {
-    *error = "\"additionalProperties\" and \"patternProperties\" are not "
-             "supported at the main schema.";
-    return scoped_ptr<PolicySchema>();
-  }
-
   return ParseSchema(*dict, error);
 }
 
 }  // namespace policy