Decouple killbit testing from external extension providers

chrome/browser/extensions/extension_prefs.h

 // Copyright (c) 2010 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_EXTENSION_PREFS_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 29 matching lines @@
   };
 
   explicit ExtensionPrefs(PrefService* prefs, const FilePath& root_dir_);
   ~ExtensionPrefs();
 
   // Returns a copy of the Extensions prefs.
   // TODO(erikkay) Remove this so that external consumers don't need to be
   // aware of the internal structure of the preferences.
   DictionaryValue* CopyCurrentExtensions();
 
-  // Populate |killed_ids| with extension ids that have been killed.
-  void GetKilledExtensionIds(std::set<std::string>* killed_ids);
+  // Returns true if the specified extension has an entry in prefs
+  // and its killbit is on.
+  bool IsExtensionKilled(const std::string& id);
 
   // Get the order that toolstrip URLs appear in the shelf.
   typedef std::vector<GURL> URLList;
   URLList GetShelfToolstripOrder();
 
   // Sets the order that toolstrip URLs appear in the shelf.
   void SetShelfToolstripOrder(const URLList& urls);
 
   // Get the order that the browser actions appear in the toolbar.
   std::vector<std::string> GetToolbarOrder();
@@ skipping 257 matching lines @@
   // Base extensions install directory.
   FilePath install_directory_;
 
   // The URLs of all of the toolstrips.
   URLList shelf_order_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrefs);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_