Remove OfflineURL from offline page

components/offline_pages/offline_page_metadata_store_sql.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/offline_pages/offline_page_metadata_store_sql.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
@@ skipping 26 matching lines @@
     " access_count INTEGER NOT NULL,"
     " status INTEGER NOT NULL DEFAULT 0,"
     // A note on this field:  It will be NULL for now and is reserved for
     // later use.  We will treat NULL as "Unknown" in any subsequent queries
     // for user_initiated values.
     " user_initiated INTEGER,"  // this is actually a boolean
     " expiration_time INTEGER NOT NULL DEFAULT 0,"
     " 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 ''"
     ")";
 
 // This is cloned from //content/browser/appcache/appcache_database.cc
 struct TableInfo {
   const char* table_name;
   const char* columns;
 };
 
 const TableInfo kOfflinePagesTable{OFFLINE_PAGES_TABLE_NAME,
                                    kOfflinePagesColumns};
 
 // This enum is used to define the indices for the columns in each row
 // that hold the different pieces of offline page.
 enum : int {
   OP_OFFLINE_ID = 0,
   OP_CREATION_TIME,
   OP_FILE_SIZE,
   OP_VERSION,
   OP_LAST_ACCESS_TIME,
   OP_ACCESS_COUNT,
   OP_STATUS,
   OP_USER_INITIATED,
   OP_EXPIRATION_TIME,  // Added in M53.
   OP_CLIENT_NAMESPACE,
   OP_CLIENT_ID,
   OP_ONLINE_URL,
-  OP_OFFLINE_URL,
+  OP_OFFLINE_URL,  // Deprecated.
   OP_FILE_PATH,
   OP_TITLE,  // Added in M54.
 };
 
 bool CreateTable(sql::Connection* db, const TableInfo& table_info) {
   std::string sql("CREATE TABLE ");
   sql += table_info.table_name;
   sql += table_info.columns;
   return db->Execute(sql.c_str());
 }
@@ skipping 306 matching lines @@
 }
 
 void OfflinePageMetadataStoreSQL::Reset(const ResetCallback& callback) {
   background_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&OfflinePageMetadataStoreSQL::ResetSync, base::Passed(&db_),
                  base::ThreadTaskRunnerHandle::Get(), callback));
 }
 
 }  // namespace offline_pages