Modify the "dangerous download" algorithm as follows. Original patch by Pier...

chrome/browser/history/download_create_info.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/browser/history/download_create_info.h"
 
 #include <string>
 
 #include "base/format_macros.h"
 #include "base/stringprintf.h"
 
 DownloadCreateInfo::DownloadCreateInfo(const FilePath& path,
                                        const GURL& url,
                                        base::Time start_time,
                                        int64 received_bytes,
                                        int64 total_bytes,
                                        int32 state,
-                                       int32 download_id)
+                                       int32 download_id,
+                                       bool has_user_gesture)
     : path(path),
       url(url),
       path_uniquifier(0),
       start_time(start_time),
       received_bytes(received_bytes),
       total_bytes(total_bytes),
       state(state),
       download_id(download_id),
+      has_user_gesture(has_user_gesture),
       child_id(-1),
       render_view_id(-1),
       request_id(-1),
       db_handle(0),
       prompt_user_for_save_location(false),
       is_dangerous(false),
       is_extension_install(false) {
 }
 
 DownloadCreateInfo::DownloadCreateInfo()
     : path_uniquifier(0),
       received_bytes(0),
       total_bytes(0),
       state(-1),
       download_id(-1),
+      has_user_gesture(has_user_gesture),
       child_id(-1),
       render_view_id(-1),
       request_id(-1),
       db_handle(0),
       prompt_user_for_save_location(false),
       is_dangerous(false),
       is_extension_install(false) {
 }
 
 DownloadCreateInfo::~DownloadCreateInfo() {
@@ skipping 15 matching lines @@
                             path.value().c_str(),
                             received_bytes,
                             total_bytes,
                             child_id,
                             render_view_id,
                             request_id,
                             download_id,
                             prompt_user_for_save_location ? 'T' : 'F');
 }