[Extensions] Remove JSONFeatureProvider, SimpleFeature::Parse

extensions/common/features/simple_feature.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_SIMPLE_FEATURE_H_
 #define EXTENSIONS_COMMON_FEATURES_SIMPLE_FEATURE_H_
 
 #include <stddef.h>
 
 #include <initializer_list>
@@ skipping 29 matching lines @@
 
    private:
     std::string* previous_id_;
 
     DISALLOW_COPY_AND_ASSIGN(ScopedWhitelistForTest);
   };
 
   SimpleFeature();
   ~SimpleFeature() override;
 
-  // Parses the JSON representation of a feature into the fields of this object.
-  // Note: Validate() should be called after this.
-  void Parse(const base::DictionaryValue* dictionary);
-
-  // Checks whether the feature is valid. Invalid features should not be used.
-  // Subclasses can override to implement specific checking, but should always
-  // call this method as well.
-  virtual bool Validate(std::string* error);
-
   Availability IsAvailableToContext(const Extension* extension,
                                     Context context) const {
     return IsAvailableToContext(extension, context, GURL());
   }
   Availability IsAvailableToContext(const Extension* extension,
                                     Context context,
                                     Platform platform) const {
     return IsAvailableToContext(extension, context, GURL(), platform);
   }
   Availability IsAvailableToContext(const Extension* extension,
@@ skipping 163 matching lines @@
   bool is_internal_;
   std::string command_line_switch_;
   std::unique_ptr<version_info::Channel> channel_;
 
   DISALLOW_COPY_AND_ASSIGN(SimpleFeature);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_FEATURES_SIMPLE_FEATURE_H_