Remove all synchronous methods from OfflinePageBridge.

components/offline_pages/stub_offline_page_model.h

Index: components/offline_pages/stub_offline_page_model.h
diff --git a/components/offline_pages/stub_offline_page_model.h b/components/offline_pages/stub_offline_page_model.h
index 09925f8af08cf9faa261f655968c6c525bd904dc..55f0c0177d602bbc7ee7d149e28688ce5ea9e802 100644
--- a/components/offline_pages/stub_offline_page_model.h
+++ b/components/offline_pages/stub_offline_page_model.h
@@ -32,6 +32,11 @@ class StubOfflinePageModel : public OfflinePageModel, public KeyedService {
   void MarkPageAccessed(int64_t offline_id) override;
   void DeletePagesByOfflineId(const std::vector<int64_t>& offline_ids,
                               const DeletePageCallback& callback) override;
+  void DeletePagesByClientIds(const std::vector<ClientId>& client_ids,
+                              const DeletePageCallback& callback) override;
+  void GetPagesByClientIds(
+      const std::vector<ClientId>& client_ids,
+      const MultipleOfflinePageItemCallback& callback) override;
   void DeleteCachedPagesByURLPredicate(
       const UrlPredicate& predicate,
       const DeletePageCallback& callback) override;
@@ -44,18 +49,12 @@ class StubOfflinePageModel : public OfflinePageModel, public KeyedService {
   void GetOfflineIdsForClientId(
       const ClientId& client_id,
       const MultipleOfflineIdCallback& callback) override;
-  const std::vector<int64_t> MaybeGetOfflineIdsForClientId(
-      const ClientId& client_id) const override;
   void GetPageByOfflineId(
       int64_t offline_id,
       const SingleOfflinePageItemCallback& callback) override;
-  const OfflinePageItem* MaybeGetPageByOfflineId(
-      int64_t offline_id) const override;
   void GetPagesByOnlineURL(
       const GURL& online_url,
       const MultipleOfflinePageItemCallback& callback) override;
-  const OfflinePageItem* MaybeGetBestPageForOnlineURL(
-      const GURL& online_url) const override;
   void ExpirePages(const std::vector<int64_t>& offline_ids,
                    const base::Time& expiration_time,
                    const base::Callback<void(bool)>& callback) override;