FeatureProvider returns std::map instead of vector

extensions/common/features/feature_provider.h

 // 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.
 
 #ifndef EXTENSIONS_COMMON_FEATURES_FEATURE_PROVIDER_H_
 #define EXTENSIONS_COMMON_FEATURES_FEATURE_PROVIDER_H_
 
+#include <map>
 #include <string>
 #include <vector>
 
+#include "base/memory/scoped_ptr.h"
+
 namespace extensions {
 
 class Feature;
 
+using FeatureMap = std::map<std::string, scoped_ptr<Feature>>;
+
 // Implemented by classes that can vend features.
 class FeatureProvider {
  public:
   FeatureProvider() {}
   virtual ~FeatureProvider() {}
 
   //
   // Static helpers.
   //
 
@@ skipping 20 matching lines @@
 
   // Returns the feature with the specified name.
   virtual Feature* GetFeature(const std::string& name) const = 0;
 
   // Returns the parent feature of |feature|, or NULL if there isn't one.
   virtual Feature* GetParent(Feature* feature) const = 0;
 
   // Returns the features inside the |parent| namespace, recursively.
   virtual std::vector<Feature*> GetChildren(const Feature& parent) const = 0;
 
-  // Returns all features described by this instance, in asciibetical order.
-  virtual const std::vector<std::string>& GetAllFeatureNames() const = 0;
+  // Returns a map containing all features described by this instance.
+  virtual const FeatureMap& GetAllFeatures() const = 0;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_FEATURES_FEATURE_PROVIDER_H_