Make ExtensionPrefValueMap a ProfileKeyedService.

chrome/browser/extensions/test_extension_system.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_BROWSER_EXTENSIONS_TEST_EXTENSION_SYSTEM_H_
 #define CHROME_BROWSER_EXTENSIONS_TEST_EXTENSION_SYSTEM_H_
 #pragma once
 
 #include "chrome/browser/extensions/extension_system.h"
 
@@ skipping 32 matching lines @@
   virtual ExtensionEventRouter* event_router() OVERRIDE;
   virtual extensions::RulesRegistryService* rules_registry_service()
       OVERRIDE;
 
   // Factory method for tests to use with SetTestingProfile.
   static ProfileKeyedService* Build(Profile* profile);
 
  private:
   Profile* profile_;
 
-  scoped_ptr<ExtensionPrefValueMap> extension_pref_value_map_;
   // The Extension Preferences. Only created if CreateExtensionService is
   // invoked.
   scoped_ptr<ExtensionPrefs> extension_prefs_;
   scoped_ptr<ExtensionService> extension_service_;
   scoped_ptr<ExtensionProcessManager> extension_process_manager_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_TEST_EXTENSION_SYSTEM_H_