chrome: Cleanup class/struct forward declarations

chrome/browser/ui/app_list/search/app_search_provider.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_UI_APP_LIST_SEARCH_APP_SEARCH_PROVIDER_H_
 #define CHROME_BROWSER_UI_APP_LIST_SEARCH_APP_SEARCH_PROVIDER_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/scoped_observer.h"
 #include "ui/app_list/search_provider.h"
 
 class AppListControllerDelegate;
 class Profile;
 
 namespace base {
 class Clock;
 }
 
 namespace app_list {
 
 class AppListItemList;
 
-namespace test {
-class AppSearchProviderTest;
-}
-
 class AppSearchProvider : public SearchProvider {
  public:
   class App;
   class DataSource;
   typedef std::vector<std::unique_ptr<App>> Apps;
 
   AppSearchProvider(Profile* profile,
                     AppListControllerDelegate* list_controller,
                     std::unique_ptr<base::Clock> clock,
                     AppListItemList* top_level_item_list);
@@ skipping 20 matching lines @@
   std::unique_ptr<base::Clock> clock_;
   std::vector<std::unique_ptr<DataSource>> data_sources_;
   base::WeakPtrFactory<AppSearchProvider> update_results_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppSearchProvider);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_APP_SEARCH_PROVIDER_H_