Introducing SavePackageId and SaveItemId as distinct IdType<...>-based types.

content/browser/download/save_item.h

 // Copyright (c) 2012 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.
 //
 #ifndef CONTENT_BROWSER_DOWNLOAD_SAVE_ITEM_H_
 #define CONTENT_BROWSER_DOWNLOAD_SAVE_ITEM_H_
 
 #include <stdint.h>
 
 #include "base/files/file_path.h"
@@ skipping 37 matching lines @@
   // Rough percent complete, -1 means we don't know (since we didn't receive a
   // total size).
   int PercentComplete() const;
 
   // Update path for SaveItem, the actual file is renamed on the file thread.
   void Rename(const base::FilePath& full_path);
 
   void SetTotalBytes(int64_t total_bytes);
 
   // Accessors.
-  int id() const { return save_item_id_; }
+  SaveItemId id() const { return save_item_id_; }
   SaveState state() const { return state_; }
   const base::FilePath& full_path() const { return full_path_; }
   const base::FilePath& file_name() const { return file_name_; }
   const GURL& url() const { return url_; }
   const Referrer& referrer() const { return referrer_; }
   int64_t total_bytes() const { return total_bytes_; }
   int64_t received_bytes() const { return received_bytes_; }
   bool has_final_name() const { return has_final_name_; }
   bool success() const { return is_success_; }
   SaveFileCreateInfo::SaveFileSource save_source() const {
     return save_source_;
   }
   SavePackage* package() const { return package_; }
 
  private:
   // Internal helper for maintaining consistent received and total sizes.
   void UpdateSize(int64_t size);
 
   // Unique identifier for this SaveItem instance.
-  const int save_item_id_;
+  const SaveItemId save_item_id_;
 
   // Full path to the save item file.
   base::FilePath full_path_;
 
   // Short display version of the file.
   base::FilePath file_name_;
 
   // The URL for this save item.
   GURL url_;
   Referrer referrer_;
@@ skipping 17 matching lines @@
 
   // Our owning object.
   SavePackage* package_;
 
   DISALLOW_COPY_AND_ASSIGN(SaveItem);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_SAVE_ITEM_H_