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

chrome/browser/renderer_host/resource_dispatcher_host_request_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/renderer_host/resource_dispatcher_host_request_info.h"
 
 #include "chrome/browser/renderer_host/resource_handler.h"
 #include "chrome/browser/ssl/ssl_client_auth_handler.h"
 #include "chrome/browser/ui/login/login_prompt.h"
 #include "webkit/blob/blob_data.h"
 
 ResourceDispatcherHostRequestInfo::ResourceDispatcherHostRequestInfo(
     ResourceHandler* handler,
     ChildProcessInfo::ProcessType process_type,
     int child_id,
     int route_id,
     int request_id,
     const std::string& frame_origin,
     const std::string& main_frame_origin,
     ResourceType::Type resource_type,
     uint64 upload_size,
     bool is_download,
     bool allow_download,
+    bool has_user_gesture,
     int host_renderer_id,
     int host_render_view_id)
     : resource_handler_(handler),
       cross_site_handler_(NULL),
       process_type_(process_type),
       child_id_(child_id),
       route_id_(route_id),
       request_id_(request_id),
       pending_data_count_(0),
       is_download_(is_download),
       allow_download_(allow_download),
+      has_user_gesture_(has_user_gesture),
       pause_count_(0),
       frame_origin_(frame_origin),
       main_frame_origin_(main_frame_origin),
       resource_type_(resource_type),
       replace_extension_localization_templates_(false),
       last_load_state_(net::LOAD_STATE_IDLE),
       upload_size_(upload_size),
       last_upload_position_(0),
       waiting_for_upload_progress_ack_(false),
       memory_cost_(0),
@@ skipping 15 matching lines @@
 
 void ResourceDispatcherHostRequestInfo::set_ssl_client_auth_handler(
     SSLClientAuthHandler* s) {
   ssl_client_auth_handler_ = s;
 }
 
 void ResourceDispatcherHostRequestInfo::set_requested_blob_data(
     webkit_blob::BlobData* data) {
   requested_blob_data_ = data;
 }