FeatureProvider returns std::map instead of vector

extensions/common/features/base_feature_provider.h

 // Copyright 2014 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.
 
 #ifndef EXTENSIONS_COMMON_FEATURES_BASE_FEATURE_PROVIDER_H_
 #define EXTENSIONS_COMMON_FEATURES_BASE_FEATURE_PROVIDER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 17 matching lines @@
   // provider create plain old Feature instances.
   BaseFeatureProvider(const base::DictionaryValue& root,
                       FeatureFactory factory);
   ~BaseFeatureProvider() override;
 
   // Gets the feature |feature_name|, if it exists.
   Feature* GetFeature(const std::string& feature_name) const override;
   Feature* GetParent(Feature* feature) const override;
   std::vector<Feature*> GetChildren(const Feature& parent) const override;
 
-  const std::vector<std::string>& GetAllFeatureNames() const override;
+  const FeatureMap& GetAllFeatures() const override;
 
  private:
   std::map<std::string, scoped_ptr<Feature>> features_;
 
   // Populated on first use.
   mutable std::vector<std::string> feature_names_;
 
   FeatureFactory factory_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_FEATURES_BASE_FEATURE_PROVIDER_H_