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

chrome/common/resource_dispatcher.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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "chrome/common/resource_dispatcher.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 93 matching lines @@
   request_.referrer = request_info.referrer;
   request_.frame_origin = request_info.frame_origin;
   request_.main_frame_origin = request_info.main_frame_origin;
   request_.headers = request_info.headers;
   request_.load_flags = request_info.load_flags;
   request_.origin_child_id = request_info.requestor_pid;
   request_.resource_type = request_info.request_type;
   request_.request_context = request_info.request_context;
   request_.appcache_host_id = request_info.appcache_host_id;
   request_.download_to_file = request_info.download_to_file;
+  request_.has_user_gesture = request_info.has_user_gesture;
   request_.host_renderer_id = host_renderer_id_;
   request_.host_render_view_id = host_render_view_id_;
 }
 
 IPCResourceLoaderBridge::~IPCResourceLoaderBridge() {
   // we remove our hook for the resource dispatcher only when going away, since
   // it doesn't keep track of whether we've force terminated the request
   if (request_id_ >= 0) {
     // this operation may fail, as the dispatcher will have preemptively
     // removed us when the renderer sends the ReceivedAllData message.
@@ skipping 484 matching lines @@
 
 // static
 void ResourceDispatcher::ReleaseResourcesInMessageQueue(MessageQueue* queue) {
   while (!queue->empty()) {
     IPC::Message* message = queue->front();
     ReleaseResourcesInDataMessage(*message);
     queue->pop_front();
     delete message;
   }
 }