Decouple killbit testing from external extension providers

chrome/browser/extensions/external_registry_extension_provider_win.h

 // Copyright (c) 2009 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_BROWSER_EXTENSIONS_EXTERNAL_REGISTRY_EXTENSION_PROVIDER_WIN_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_REGISTRY_EXTENSION_PROVIDER_WIN_H_
 #pragma once
 
-#include <set>
-#include <string>
-
 #include "chrome/browser/extensions/external_extension_provider.h"
 
 class Version;
 
 // A specialization of the ExternalExtensionProvider that uses the Registry to
 // look up which external extensions are registered.
 class ExternalRegistryExtensionProvider : public ExternalExtensionProvider {
  public:
   ExternalRegistryExtensionProvider();
   virtual ~ExternalRegistryExtensionProvider();
 
   // ExternalExtensionProvider implementation:
-  virtual void VisitRegisteredExtension(
-      Visitor* visitor, const std::set<std::string>& ids_to_ignore) const;
+  virtual void VisitRegisteredExtension(Visitor* visitor) const;
 
   virtual bool HasExtension(const std::string& id) const;
 
   virtual bool GetExtensionDetails(const std::string& id,
                                    Extension::Location* location,
                                    scoped_ptr<Version>* version) const;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_REGISTRY_EXTENSION_PROVIDER_WIN_H_