[Extensions] Fix FeatureProvider::GetChildren()

extensions/common/features/feature_provider.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 "extensions/common/features/feature_provider.h"
 
 #include <map>
 #include <memory>
 
 #include "base/command_line.h"
@@ skipping 146 matching lines @@
 
   // All children have names before (parent.name() + ('.'+1)).
   ++prefix.back();
   const FeatureMap::const_iterator after_children =
       features_.lower_bound(prefix);
 
   std::vector<Feature*> result;
   result.reserve(std::distance(first_child, after_children));
   for (FeatureMap::const_iterator it = first_child; it != after_children;
        ++it) {
-    result.push_back(it->second.get());
+    if (!it->second->no_parent())
+      result.push_back(it->second.get());
   }
   return result;
 }
 
 const FeatureMap& FeatureProvider::GetAllFeatures() const {
   return features_;
 }
 
 void FeatureProvider::AddFeature(base::StringPiece name,
                                  std::unique_ptr<Feature> feature) {
   features_[name.as_string()] = std::move(feature);
 }
 
 void FeatureProvider::AddFeature(base::StringPiece name, Feature* feature) {
   features_[name.as_string()] = std::unique_ptr<Feature>(feature);
 }
 
 }  // namespace extensions