Expose final download URL (actual url after redirects) in the extension API.

chrome/browser/download/download_query.h

Index: chrome/browser/download/download_query.h
diff --git a/chrome/browser/download/download_query.h b/chrome/browser/download/download_query.h
index 980e53110b4879a67d3476be3aeea657b85f3ebf..563e35292fdd80f11b7e03d88c34c8149dc24c99 100644
--- a/chrome/browser/download/download_query.h
+++ b/chrome/browser/download/download_query.h
@@ -69,6 +69,8 @@ class DownloadQuery {
     FILTER_TOTAL_BYTES,          // int
     FILTER_TOTAL_BYTES_GREATER,  // int
     FILTER_TOTAL_BYTES_LESS,     // int
+    FILTER_ORIGINAL_URL,         // string
+    FILTER_ORIGINAL_URL_REGEX,   // string
     FILTER_URL,                  // string
     FILTER_URL_REGEX,            // string
   };
@@ -85,6 +87,7 @@ class DownloadQuery {
     SORT_START_TIME,
     SORT_STATE,
     SORT_TOTAL_BYTES,
+    SORT_ORIGINAL_URL,
     SORT_URL,
   };