Option-click to download should not display "Save As" UI.

chrome/browser/renderer_host/resource_dispatcher_host.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/browser/renderer_host/resource_dispatcher_host.h"
 
 #include <vector>
 
@@ skipping 544 matching lines @@
                        params.closing_route_id,
                        &RenderViewHost::ClosePageIgnoringUnloadEvents);
   }
 }
 
 // We are explicitly forcing the download of 'url'.
 void ResourceDispatcherHost::BeginDownload(
     const GURL& url,
     const GURL& referrer,
     const DownloadSaveInfo& save_info,
+    bool prompt_for_save_location,
     int child_id,
     int route_id,
     URLRequestContext* request_context) {
   if (is_shutdown_)
     return;
 
   // Check if the renderer is permitted to request the requested URL.
   if (!ChildProcessSecurityPolicy::GetInstance()->
           CanRequestURL(child_id, url)) {
     LOG(INFO) << "Denied unauthorized download request for " <<
         url.possibly_invalid_spec();
     return;
   }
 
   // Ensure the Chrome plugins are loaded, as they may intercept network
   // requests.  Does nothing if they are already loaded.
   PluginService::GetInstance()->LoadChromePlugins(this);
   URLRequest* request = new URLRequest(url, this);
 
   request_id_--;
 
   scoped_refptr<ResourceHandler> handler =
       new DownloadResourceHandler(this,
                                   child_id,
                                   route_id,
                                   request_id_,
                                   url,
                                   download_file_manager_.get(),
                                   request,
-                                  true,
+                                  prompt_for_save_location,
                                   save_info);
 
 
   if (safe_browsing_->enabled()) {
     handler = new SafeBrowsingResourceHandler(handler,
                                               child_id,
                                               route_id,
                                               ResourceType::MAIN_FRAME,
                                               safe_browsing_,
                                               this,
@@ skipping 1208 matching lines @@
     // them.
     case ResourceType::IMAGE:
       return net::LOWEST;
 
     default:
       // When new resource types are added, their priority must be considered.
       NOTREACHED();
       return net::LOW;
   }
 }