[Offline Pages] Removes the unused "HasPages" function.

components/offline_pages/offline_page_model_impl.h

 // Copyright 2016 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_IMPL_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 61 matching lines @@
                 int64_t proposed_offline_id,
                 std::unique_ptr<OfflinePageArchiver> archiver,
                 const SavePageCallback& callback) override;
   void MarkPageAccessed(int64_t offline_id) override;
   void ClearAll(const base::Closure& callback) override;
   void DeletePagesByOfflineId(const std::vector<int64_t>& offline_ids,
                               const DeletePageCallback& callback) override;
   void DeleteCachedPagesByURLPredicate(
       const UrlPredicate& predicate,
       const DeletePageCallback& callback) override;
-  void HasPages(const std::string& name_space,
-                const HasPagesCallback& callback) override;
   void CheckPagesExistOffline(
       const std::set<GURL>& urls,
       const CheckPagesExistOfflineCallback& callback) override;
   void GetAllPages(const MultipleOfflinePageItemCallback& callback) override;
   void GetAllPagesWithExpired(
       const MultipleOfflinePageItemCallback& callback) override;
   void GetOfflineIdsForClientId(
       const ClientId& client_id,
       const MultipleOfflineIdCallback& callback) override;
   const std::vector<int64_t> MaybeGetOfflineIdsForClientId(
@@ skipping 61 matching lines @@
       const SingleOfflinePageItemCallback& callback) const;
   void GetPagesByOnlineURLWhenLoadDone(
       const GURL& offline_url,
       const MultipleOfflinePageItemCallback& callback) const;
   void GetPageByOfflineURLWhenLoadDone(
       const GURL& offline_url,
       const SingleOfflinePageItemCallback& callback) const;
   void MarkPageAccessedWhenLoadDone(int64_t offline_id);
   void CheckMetadataConsistencyWhenLoadDone();
 
-  // Callback for checking whether we have offline pages.
-  void HasPagesAfterLoadDone(const std::string& name_space,
-                             const HasPagesCallback& callback) const;
-
   // Callback for loading pages from the offline page metadata store.
   void OnLoadDone(const base::TimeTicks& start_time,
                   OfflinePageMetadataStore::LoadStatus load_status,
                   const std::vector<OfflinePageItem>& offline_pages);
 
   // Steps for saving a page offline.
   void OnCreateArchiveDone(const GURL& requested_url,
                            int64_t offline_id,
                            const ClientId& client_id,
                            const base::Time& start_time,
@@ skipping 130 matching lines @@
   base::Clock* testing_clock_;
 
   base::WeakPtrFactory<OfflinePageModelImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflinePageModelImpl);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_IMPL_H_