Persist download interrupt reason, both target and current paths, and url_chain.

chrome/browser/history/download_database.h

Index: chrome/browser/history/download_database.h
diff --git a/chrome/browser/history/download_database.h b/chrome/browser/history/download_database.h
index 8cf07ab44b1c5a4b575f193eac84c7e8a93d0389..a8ab3edbafd404237072e329655ff61397f0f456 100644
--- a/chrome/browser/history/download_database.h
+++ b/chrome/browser/history/download_database.h
@@ -69,6 +69,10 @@ class DownloadDatabase {
   // database. See http://crbug.com/140687
   bool MigrateDownloadsState();
 
+  // Returns true if able to successfully add the last interrupt reason and the
+  // two target paths to downloads.
+  bool MigrateDownloadsReasonAndPaths();
+
   // Creates the downloads table if needed.
   bool InitDownloadTable();