[Offline pages] OPMStoreSQL: Upgrade to M55, Upgrade refactoring, conversion refactoring

components/offline_pages/offline_page_item.cc

 // Copyright 2015 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_item.h"
 
 #include "net/base/filename_util.h"
 
 namespace offline_pages {
 
-namespace {
-const int kCurrentVersion = 1;
-}
-
 ClientId::ClientId() : name_space(""), id("") {}
 
 ClientId::ClientId(std::string name_space, std::string id)
     : name_space(name_space), id(id) {}
 
 bool ClientId::operator==(const ClientId& client_id) const {
   return name_space == client_id.name_space && id == client_id.id;
 }
 
 bool ClientId::operator<(const ClientId& client_id) const {
   if (name_space == client_id.name_space)
     return (id < client_id.id);
 
   return name_space < client_id.name_space;
 }
 
 OfflinePageItem::OfflinePageItem()
-    : version(kCurrentVersion),
-      file_size(0),
-      access_count(0),
-      flags(NO_FLAG) {
-}
+    : file_size(0), access_count(0), flags(NO_FLAG) {}
 
 OfflinePageItem::OfflinePageItem(const GURL& url,
                                  int64_t offline_id,
                                  const ClientId& client_id,
                                  const base::FilePath& file_path,
                                  int64_t file_size)
     : url(url),
       offline_id(offline_id),
       client_id(client_id),
-      version(kCurrentVersion),
       file_path(file_path),
       file_size(file_size),
       access_count(0),
       flags(NO_FLAG) {}
 
 OfflinePageItem::OfflinePageItem(const GURL& url,
                                  int64_t offline_id,
                                  const ClientId& client_id,
                                  const base::FilePath& file_path,
                                  int64_t file_size,
                                  const base::Time& creation_time)
     : url(url),
       offline_id(offline_id),
       client_id(client_id),
-      version(kCurrentVersion),
       file_path(file_path),
       file_size(file_size),
       creation_time(creation_time),
       last_access_time(creation_time),
       access_count(0),
       flags(NO_FLAG) {}
 
 OfflinePageItem::OfflinePageItem(const OfflinePageItem& other) = default;
 
 OfflinePageItem::~OfflinePageItem() {
 }
 
 GURL OfflinePageItem::GetOfflineURL() const {
   return net::FilePathToFileURL(file_path);
 }
 
 bool OfflinePageItem::IsExpired() const {
   return creation_time < expiration_time;
 }
 
 }  // namespace offline_pages