Changing inheritance to composition.

chrome/common/extensions/features/manifest_feature.h

 // Copyright (c) 2012 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 CHROME_COMMON_EXTENSIONS_FEATURES_MANIFEST_FEATURE_H_
 #define CHROME_COMMON_EXTENSIONS_FEATURES_MANIFEST_FEATURE_H_
 
 #include "chrome/common/extensions/features/feature.h"
 
 namespace extensions {
 
 class ManifestFeature : public Feature {
  public:
-  ManifestFeature();
+  explicit ManifestFeature(scoped_ptr<Feature> feature);
   virtual ~ManifestFeature();
 
   virtual Feature::Availability IsAvailableToContext(
       const Extension* extension,
       Feature::Context context,
       Feature::Platform platform) const OVERRIDE;
+
+ private:
+  scoped_ptr<Feature> feature_;
 };
 
 }  // extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_FEATURES_MANIFEST_FEATURE_H_