Drop more dependencies of ProfileKeyedService infrastructure on chrome.

chrome/browser/extensions/api/discovery/suggested_links_registry_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_DISCOVERY_SUGGESTED_LINKS_REGISTRY_FACTORY_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DISCOVERY_SUGGESTED_LINKS_REGISTRY_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
+class Profile;
+
 namespace extensions {
 
 class SuggestedLinksRegistry;
 
 // Singleton that associate SuggestedLinksRegistry objects with Profiles.
 class SuggestedLinksRegistryFactory : public ProfileKeyedServiceFactory {
  public:
   static SuggestedLinksRegistry* GetForProfile(Profile* profile);
 
   static SuggestedLinksRegistryFactory* GetInstance();
@@ skipping 12 matching lines @@
       content::BrowserContext* profile) const OVERRIDE;
   virtual content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(SuggestedLinksRegistryFactory);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DISCOVERY_SUGGESTED_LINKS_REGISTRY_FACTORY_H_