chrome: Cleanup class/struct forward declarations

chrome/browser/search/hotword_service_factory.h

 // Copyright 2013 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_SEARCH_HOTWORD_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_FACTORY_H_
 
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 class HotwordService;
-class Profile;
 
 // Singleton that owns all HotwordServices and associates them with Profiles.
 class HotwordServiceFactory : public BrowserContextKeyedServiceFactory {
  public:
   // Returns the HotwordService for |context|.
   static HotwordService* GetForProfile(content::BrowserContext* context);
 
   static HotwordServiceFactory* GetInstance();
 
   // Returns true if the hotwording service is available for |context|.
@@ skipping 26 matching lines @@
   // Overrides from BrowserContextKeyedServiceFactory:
   void RegisterProfilePrefs(
       user_prefs::PrefRegistrySyncable* registry) override;
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(HotwordServiceFactory);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_FACTORY_H_