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

components/offline_pages/offline_page_model_impl.h

Index: components/offline_pages/offline_page_model_impl.h
diff --git a/components/offline_pages/offline_page_model_impl.h b/components/offline_pages/offline_page_model_impl.h
index 20f9cc2e8cd95048cb108605f289e8c19af9bbb6..d220c0fff13e20ff317fe3e933a8852317819acf 100644
--- a/components/offline_pages/offline_page_model_impl.h
+++ b/components/offline_pages/offline_page_model_impl.h
@@ -79,8 +79,6 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
   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;
@@ -162,10 +160,6 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
   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,