components: Cleanup class/struct fwd declarations

components/history/core/browser/history_service.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 COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 24 matching lines @@
 #include "components/history/core/browser/keyword_id.h"
 #include "components/history/core/browser/typed_url_syncable_service.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/sync/model/syncable_service.h"
 #include "sql/init_status.h"
 #include "ui/base/page_transition_types.h"
 
 class GURL;
 class HistoryQuickProviderTest;
 class HistoryURLProvider;
-class HistoryURLProviderTest;
 class InMemoryURLIndexTest;
 class SkBitmap;
 class SyncBookmarkDataTypeControllerTest;
 class TestingProfile;
 
 namespace base {
 class FilePath;
 class Thread;
 }
 
 namespace favicon {
 class FaviconService;
 }
 
 namespace history {
 
 struct DownloadRow;
 struct HistoryAddPageArgs;
 class HistoryBackend;
 class HistoryClient;
 class HistoryDBTask;
-class HistoryDatabase;
 struct HistoryDatabaseParams;
 class HistoryQueryTest;
 class HistoryServiceObserver;
 class HistoryServiceTest;
 class InMemoryHistoryBackend;
-struct KeywordSearchTermVisit;
 class URLDatabase;
 class VisitDelegate;
 class WebHistoryService;
 
 // The history service records page titles, and visit times, as well as
 // (eventually) information about autocomplete.
 //
 // This service is thread safe. Each request callback is invoked in the
 // thread that made the request.
 class HistoryService : public syncer::SyncableService, public KeyedService {
@@ skipping 755 matching lines @@
 
   // All vended weak pointers are invalidated in Cleanup().
   base::WeakPtrFactory<HistoryService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryService);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_