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

content/browser/download/save_types.cc

Index: content/browser/download/save_types.cc
diff --git a/content/browser/download/save_types.cc b/content/browser/download/save_types.cc
index a2029babd2bcf7520ccd30446d288bc90546f600..9c4972a88547c065c4e91bbaa6d67b880bafed83 100644
--- a/content/browser/download/save_types.cc
+++ b/content/browser/download/save_types.cc
@@ -10,8 +10,8 @@ namespace content {
 
 SaveFileCreateInfo::SaveFileCreateInfo(const base::FilePath& path,
                                        const GURL& url,
-                                       int save_item_id,
-                                       int save_package_id,
+                                       SaveItemId save_item_id,
+                                       SavePackageId save_package_id,
                                        int render_process_id,
                                        int render_frame_routing_id,
                                        SaveFileSource save_source)
@@ -27,8 +27,8 @@ SaveFileCreateInfo::SaveFileCreateInfo(const base::FilePath& path,
 
 SaveFileCreateInfo::SaveFileCreateInfo(const GURL& url,
                                        const GURL& final_url,
-                                       int save_item_id,
-                                       int save_package_id,
+                                       SaveItemId save_item_id,
+                                       SavePackageId save_package_id,
                                        int render_process_id,
                                        int render_frame_routing_id,
                                        int request_id,