[Offline Pages] Removing client in storage manager.

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 b32798ba3bc78347f34fff43bb72cc69f98aa9fe..a7688f6d3fd7b74c03d0f77baaf8b52780c5e9c6 100644
--- a/components/offline_pages/offline_page_model_impl.h
+++ b/components/offline_pages/offline_page_model_impl.h
@@ -67,9 +67,9 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
                 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 ClearAll(const base::Closure& callback) override;
   void DeletePagesByURLPredicate(const UrlPredicate& predicate,
                                  const DeletePageCallback& callback) override;
   void HasPages(const std::string& name_space,
@@ -128,7 +128,7 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
   void OnEnsureArchivesDirCreatedDone(const base::TimeTicks& start_time);
 
   void GetAllPagesAfterLoadDone(
-      const MultipleOfflinePageItemCallback& callback);
+      const MultipleOfflinePageItemCallback& callback) const;
   void CheckPagesExistOfflineAfterLoadDone(
       const std::set<GURL>& urls,
       const CheckPagesExistOfflineCallback& callback);