components: Cleanup class/struct fwd declarations

components/offline_pages/offline_page_model.h

 // Copyright 2015 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_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/supports_user_data.h"
 #include "components/offline_pages/offline_event_logger.h"
 #include "components/offline_pages/offline_page_archiver.h"
 #include "components/offline_pages/offline_page_model_query.h"
 #include "components/offline_pages/offline_page_storage_manager.h"
 #include "components/offline_pages/offline_page_types.h"
 
 class GURL;
 namespace base {
 class Time;
 }  // namespace base
 
 namespace offline_pages {
 
 struct ClientId;
-struct OfflinePageItem;
 
 // Service for saving pages offline, storing the offline copy and metadata, and
 // retrieving them upon request.
 //
 // Example usage:
 //   class ArchiverImpl : public OfflinePageArchiver {
 //     // This is a class that knows how to create archiver
 //     void CreateArchiver(...) override;
 //     ...
 //   }
@@ skipping 147 matching lines @@
   // TODO(dougarnett): Remove this and its uses.
   virtual bool is_loaded() const = 0;
 
   // Returns the logger. Ownership is retained by the model.
   virtual OfflineEventLogger* GetLogger() = 0;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_