[Offline Pages] Filtering expired pages and fix consistency check.

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 45102e130c4cf7d7d1f5c534736185ec6d79a7bc..c17773ef05aae27c64c716d70803a5d761d0e196 100644
--- a/components/offline_pages/stub_offline_page_model.h
+++ b/components/offline_pages/stub_offline_page_model.h
@@ -62,7 +62,7 @@ class StubOfflinePageModel : public OfflinePageModel {
       const SingleOfflinePageItemCallback callback) override;
   const OfflinePageItem* MaybeGetBestPageForOnlineURL(
       const GURL& online_url) const override;
-  void CheckForExternalFileDeletion() override;
+  void CheckMetadataConsistency() override;
   void ExpirePages(const std::vector<int64_t>& offline_ids,
                    const base::Time& expiration_time,
                    const base::Callback<void(bool)>& callback) override;