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

chrome/common/render_messages_params.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/common/render_messages_params.h"
 
 #include "chrome/common/navigation_gesture.h"
 #include "chrome/common/common_param_traits.h"
 #include "chrome/common/indexed_db_param_traits.h"
 #include "chrome/common/render_messages.h"
@@ skipping 48 matching lines @@
 ViewMsg_ClosePage_Params::~ViewMsg_ClosePage_Params() {
 }
 
 ViewHostMsg_Resource_Request::ViewHostMsg_Resource_Request()
     : load_flags(0),
       origin_child_id(0),
       resource_type(ResourceType::MAIN_FRAME),
       request_context(0),
       appcache_host_id(0),
       download_to_file(false),
+      has_user_gesture(false),
       host_renderer_id(0),
       host_render_view_id(0) {
 }
 
 ViewHostMsg_Resource_Request::~ViewHostMsg_Resource_Request() {
 }
 
 ViewMsg_Print_Params::ViewMsg_Print_Params()
     : margin_top(0),
       margin_left(0),
@@ skipping 852 matching lines @@
   WriteParam(m, p.frame_origin);
   WriteParam(m, p.main_frame_origin);
   WriteParam(m, p.headers);
   WriteParam(m, p.load_flags);
   WriteParam(m, p.origin_child_id);
   WriteParam(m, p.resource_type);
   WriteParam(m, p.request_context);
   WriteParam(m, p.appcache_host_id);
   WriteParam(m, p.upload_data);
   WriteParam(m, p.download_to_file);
+  WriteParam(m, p.has_user_gesture);
   WriteParam(m, p.host_renderer_id);
   WriteParam(m, p.host_render_view_id);
 }
 
 bool ParamTraits<ViewHostMsg_Resource_Request>::Read(const Message* m,
                                                      void** iter,
                                                      param_type* r) {
   return
       ReadParam(m, iter, &r->method) &&
       ReadParam(m, iter, &r->url) &&
       ReadParam(m, iter, &r->first_party_for_cookies) &&
       ReadParam(m, iter, &r->referrer) &&
       ReadParam(m, iter, &r->frame_origin) &&
       ReadParam(m, iter, &r->main_frame_origin) &&
       ReadParam(m, iter, &r->headers) &&
       ReadParam(m, iter, &r->load_flags) &&
       ReadParam(m, iter, &r->origin_child_id) &&
       ReadParam(m, iter, &r->resource_type) &&
       ReadParam(m, iter, &r->request_context) &&
       ReadParam(m, iter, &r->appcache_host_id) &&
       ReadParam(m, iter, &r->upload_data) &&
       ReadParam(m, iter, &r->download_to_file) &&
+      ReadParam(m, iter, &r->has_user_gesture) &&
       ReadParam(m, iter, &r->host_renderer_id) &&
       ReadParam(m, iter, &r->host_render_view_id);
 }
 
 void ParamTraits<ViewHostMsg_Resource_Request>::Log(const param_type& p,
                                                     std::string* l) {
   l->append("(");
   LogParam(p.method, l);
   l->append(", ");
   LogParam(p.url, l);
   l->append(", ");
   LogParam(p.referrer, l);
   l->append(", ");
   LogParam(p.frame_origin, l);
   l->append(", ");
   LogParam(p.main_frame_origin, l);
   l->append(", ");
   LogParam(p.load_flags, l);
   l->append(", ");
   LogParam(p.origin_child_id, l);
   l->append(", ");
   LogParam(p.resource_type, l);
   l->append(", ");
   LogParam(p.request_context, l);
   l->append(", ");
   LogParam(p.appcache_host_id, l);
   l->append(", ");
   LogParam(p.download_to_file, l);
   l->append(", ");
+  LogParam(p.has_user_gesture, l);
+  l->append(", ");
   LogParam(p.host_renderer_id, l);
   l->append(", ");
   LogParam(p.host_render_view_id, l);
   l->append(")");
 }
 
 void ParamTraits<ViewMsg_Print_Params>::Write(Message* m, const param_type& p) {
   WriteParam(m, p.page_size);
   WriteParam(m, p.printable_size);
   WriteParam(m, p.margin_top);
@@ skipping 926 matching lines @@
     const param_type& p,
     std::string* l) {
   l->append("(");
   LogParam(p.notification_type, l);
   l->append(", ");
   LogParam(p.acc_obj, l);
   l->append(")");
 }
 
 }  // namespace IPC