porting bug 174197, font error when link bookmarked

browser/components/bookmarks/content/bookmarks.js

@@ -1461,9 +1461,7 @@ var BookmarksUtils = {
         break;
       case "text/x-moz-url":
       case "text/unicode":
-        var charSet = aDragSession.sourceDocument ? 
-                      aDragSession.sourceDocument.characterSet : null;
-        rSource = BookmarksUtils.createBookmark(null, uri, charSet, extra);
+        rSource = BookmarksUtils.createBookmark(null, uri, null, extra);
         parent = null;
         break;
       }