Remove OfflineURL from offline page

components/offline_pages/offline_page_metadata_store_sql.cc

Index: components/offline_pages/offline_page_metadata_store_sql.cc
diff --git a/components/offline_pages/offline_page_metadata_store_sql.cc b/components/offline_pages/offline_page_metadata_store_sql.cc
index e99e267884f3d850179686ad4dfca424fb64fa5a..04ea369e1c8ea7aef2a7121f542e4b9598cf2d65 100644
--- a/components/offline_pages/offline_page_metadata_store_sql.cc
+++ b/components/offline_pages/offline_page_metadata_store_sql.cc
@@ -44,7 +44,7 @@ const char kOfflinePagesColumns[] =
     " client_namespace VARCHAR NOT NULL,"
     " client_id VARCHAR NOT NULL,"
     " online_url VARCHAR NOT NULL,"
-    " offline_url VARCHAR NOT NULL DEFAULT '',"
+    " offline_url VARCHAR NOT NULL DEFAULT '',"  // Deprecated.
     " file_path VARCHAR NOT NULL,"
     " title VARCHAR NOT NULL DEFAULT ''"
     ")";
@@ -73,7 +73,7 @@ enum : int {
   OP_CLIENT_NAMESPACE,
   OP_CLIENT_ID,
   OP_ONLINE_URL,
-  OP_OFFLINE_URL,
+  OP_OFFLINE_URL,  // Deprecated.
   OP_FILE_PATH,
   OP_TITLE,  // Added in M54.
 };