Use std::unique_ptr to express ownership of base::Value in PolicyMap::Entry

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 8485b41589e4008114a631acdaef31c708e67377..221f90637e967e6663fa1c76c91efb0e23ffec9d 100644
--- a/components/policy/core/common/schema_map.cc
+++ b/components/policy/core/common/schema_map.cc
@@ -71,7 +71,7 @@ void SchemaMap::FilterBundle(PolicyBundle* bundle) const {
     for (PolicyMap::const_iterator it_map = map->begin();
          it_map != map->end();) {
       const std::string& policy_name = it_map->first;
-      const base::Value* policy_value = it_map->second.value;
+      const base::Value* policy_value = it_map->second.value.get();
       Schema policy_schema = schema->GetProperty(policy_name);
       ++it_map;
       std::string error_path;