Support dragging a virtual file out of the browser.

chrome/browser/renderer_host/download_resource_handler.cc

Index: chrome/browser/renderer_host/download_resource_handler.cc
===================================================================
--- chrome/browser/renderer_host/download_resource_handler.cc	(revision 35459)
+++ chrome/browser/renderer_host/download_resource_handler.cc	(working copy)
@@ -20,7 +20,8 @@
                                                  const GURL& url,
                                                  DownloadFileManager* manager,
                                                  URLRequest* request,
-                                                 bool save_as)
+                                                 bool save_as,
+                                                 const FilePath& save_file_path)
     : download_id_(-1),
       global_id_(render_process_host_id, request_id),
       render_view_id_(render_view_id),
@@ -29,6 +30,7 @@
       download_manager_(manager),
       request_(request),
       save_as_(save_as),
+      save_file_path_(save_file_path),
       buffer_(new DownloadBuffer),
       rdh_(rdh),
       is_paused_(false) {
@@ -67,9 +69,10 @@
   info->request_id = global_id_.request_id;
   info->content_disposition = content_disposition_;
   info->mime_type = response->response_head.mime_type;
-  info->save_as = save_as_;
+  info->save_as = save_as_ && save_file_path_.empty();
   info->is_dangerous = false;
   info->referrer_charset = request_->context()->referrer_charset();
+  info->save_file_path = save_file_path_;
   ChromeThread::PostTask(
       ChromeThread::FILE, FROM_HERE,
       NewRunnableMethod(