Enable _api_features.json to block APIs from service worker contexts.

chrome/common/extensions/features/complex_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_COMPLEX_FEATURE_H_
 #define CHROME_COMMON_EXTENSIONS_FEATURES_COMPLEX_FEATURE_H_
 
 #include <string>
 
 #include "base/memory/scoped_vector.h"
@@ skipping 19 matching lines @@
                                              Location location,
                                              int manifest_version,
                                              Platform platform) const OVERRIDE;
 
   virtual Availability IsAvailableToContext(const Extension* extension,
                                             Context context,
                                             const GURL& url,
                                             Platform platform) const OVERRIDE;
 
   virtual bool IsIdInWhitelist(const std::string& extension_id) const OVERRIDE;
+  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  // CHROME_COMMON_EXTENSIONS_FEATURES_COMPLEX_FEATURE_H_