Remove ExtensionPrefFactory's dependency on Profile.

chrome/browser/extensions/extension_pref_value_map_factory.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_EXTENSION_PREF_VALUE_MAP_FACTORY_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREF_VALUE_MAP_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
 
 class ExtensionPrefValueMap;
-class Profile;
 
 // The usual factory boilerplate for ExtensionPrefValueMap.
 class ExtensionPrefValueMapFactory : public BrowserContextKeyedServiceFactory {
  public:
   static ExtensionPrefValueMap* GetForBrowserContext(
       content::BrowserContext* context);
 
   static ExtensionPrefValueMapFactory* GetInstance();
 
  private:
   friend struct DefaultSingletonTraits<ExtensionPrefValueMapFactory>;
 
   ExtensionPrefValueMapFactory();
   virtual ~ExtensionPrefValueMapFactory();
 
   virtual BrowserContextKeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const OVERRIDE;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREF_VALUE_MAP_FACTORY_H_