Remove GetContexts() from the public interface of extensions::Feature. It was

extensions/common/features/complex_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_COMPLEX_FEATURE_H_
 #define EXTENSIONS_COMMON_FEATURES_COMPLEX_FEATURE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 31 matching lines @@
   virtual bool IsBlockedInServiceWorker() const OVERRIDE;
 
  protected:
   // extensions::Feature:
   virtual std::string GetAvailabilityMessage(
       AvailabilityResult result,
       Manifest::Type type,
       const GURL& url,
       Context context) const OVERRIDE;
 
-  virtual std::set<Context>* GetContexts() OVERRIDE;
-
   virtual bool IsInternal() const OVERRIDE;
 
  private:
   FeatureList features_;
 
   DISALLOW_COPY_AND_ASSIGN(ComplexFeature);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_FEATURES_COMPLEX_FEATURE_H_