components: Cleanup class/struct fwd declarations

components/offline_pages/offline_page_metadata_store.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_METADATA_STORE_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/callback.h"
 #include "components/offline_pages/offline_page_item.h"
 #include "components/offline_pages/offline_store_types.h"
 
-class GURL;
-
 namespace offline_pages {
 
 typedef StoreUpdateResult<OfflinePageItem> OfflinePagesUpdateResult;
 
 // OfflinePageMetadataStore keeps metadata for the offline pages.
 // Ability to create multiple instances of the store as well as behavior of
 // asynchronous operations when the object is being destroyed, before such
 // operation finishes will depend on implementation. It should be possible to
 // issue multiple asynchronous operations in parallel.
 class OfflinePageMetadataStore {
@@ skipping 43 matching lines @@
   // Resets the store.
   virtual void Reset(const ResetCallback& callback) = 0;
 
   // Gets the store state.
   virtual StoreState state() const = 0;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_