Drop more dependencies of ProfileKeyedService infrastructure on chrome.

chrome/browser/extensions/api/idle/idle_manager_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_API_IDLE_IDLE_MANAGER_FACTORY_H__
 #define CHROME_BROWSER_EXTENSIONS_API_IDLE_IDLE_MANAGER_FACTORY_H__
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
+class Profile;
+
 namespace extensions {
 class IdleManager;
 
 class IdleManagerFactory : public ProfileKeyedServiceFactory {
  public:
   static IdleManager* GetForProfile(Profile* profile);
 
   static IdleManagerFactory* GetInstance();
 
  private:
   friend struct DefaultSingletonTraits<IdleManagerFactory>;
 
   IdleManagerFactory();
   virtual ~IdleManagerFactory();
 
   // ProfileKeyedBaseFactory implementation.
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const OVERRIDE;
   virtual content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const OVERRIDE;
   virtual bool ServiceIsCreatedWithProfile() const OVERRIDE;
   virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_IDLE_IDLE_MANAGER_FACTORY_H__