Load extensions features file separately when needed

chrome/common/extensions/features/base_feature_provider.h

Index: chrome/common/extensions/features/base_feature_provider.h
diff --git a/chrome/common/extensions/features/base_feature_provider.h b/chrome/common/extensions/features/base_feature_provider.h
index 389f8acb0649b3b899743923de0e2e07cd82046b..c7289434a0c3f0d3dcab9540e4c9a4cad4a9106a 100644
--- a/chrome/common/extensions/features/base_feature_provider.h
+++ b/chrome/common/extensions/features/base_feature_provider.h
@@ -26,24 +26,15 @@ class BaseFeatureProvider : public FeatureProvider {
   BaseFeatureProvider(const DictionaryValue& root, FeatureFactory factory);
   virtual ~BaseFeatureProvider();
 
-  // Gets an instance for the _api_features.json file that is baked into
-  // Chrome as a resource.
-  static BaseFeatureProvider* GetAPIFeatures();
+  // Gets a feature provider for a specific feature type, like "permission".
+  static FeatureProvider* GetByName(const std::string& name);
 
-  // Gets an instance for the _manifest_features.json file that is baked into
-  // Chrome as a resource.
-  static BaseFeatureProvider* GetManifestFeatures();
-
-  // Gets an instance for the _permission_features.json file that is baked into
-  // Chrome as a resource.
-  static BaseFeatureProvider* GetPermissionFeatures();
-
-  // Returns all features described by this instance.
-  std::set<std::string> GetAllFeatureNames() const;
 
   // Gets the feature |feature_name|, if it exists.
   virtual Feature* GetFeature(const std::string& feature_name) OVERRIDE;
 
+  virtual std::set<std::string> GetAllFeatureNames() OVERRIDE;
+
  private:
   typedef std::map<std::string, linked_ptr<Feature> > FeatureMap;
   FeatureMap features_;