[Offline Pages] Removes two-step expiration related.

components/offline_pages/offline_page_metadata_store_sql.h

Index: components/offline_pages/offline_page_metadata_store_sql.h
diff --git a/components/offline_pages/offline_page_metadata_store_sql.h b/components/offline_pages/offline_page_metadata_store_sql.h
index afe69ce194b88c7e39cff474422221294a2c3473..cc86acf4a7eaab53bb75b749254bba3381bceb74 100644
--- a/components/offline_pages/offline_page_metadata_store_sql.h
+++ b/components/offline_pages/offline_page_metadata_store_sql.h
@@ -34,7 +34,7 @@ namespace offline_pages {
 // * In M54 title was added,
 // * In M55 we dropped the following fields (never used): version, status,
 //   offline_url, user_initiated.
-// * In M56 original_url was added.
+// * In M56 we dropped expiration_time and added original_url.

[fgorski, 2016/11/18 00:13:04]

I think you should consider your patch for M57 no M56.

[romax, 2016/11/18 20:50:49]

Done.

 //
 // Here is a procedure to update the schema for this store:
 // * Decide how to detect that the store is on a particular version, which