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

components/policy/core/common/policy_schema.cc

Index: components/policy/core/common/policy_schema.cc
diff --git a/components/policy/core/common/policy_schema.cc b/components/policy/core/common/policy_schema.cc
index 8c3145ce43afdd1e79d2c34e5c7dd8ac7e9e5caa..7e9ab7dc31cd1865af5a9d255c7b42ff9423e3bb 100644
--- a/components/policy/core/common/policy_schema.cc
+++ b/components/policy/core/common/policy_schema.cc
@@ -230,14 +230,6 @@ scoped_ptr<PolicySchema> PolicySchema::Parse(const std::string& content,
     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);
 }