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

chrome/browser/renderer_host/resource_dispatcher_host.h

 // 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.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the child process (i.e. [Renderer, Plugin, Worker]ProcessHost), and
 // dispatches them to URLRequests. It then fowards the messages from the
 // URLRequests back to the correct process for handling.
 //
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
@@ skipping 91 matching lines @@
   // If it was, message_was_ok will be false iff the message was corrupt.
   bool OnMessageReceived(const IPC::Message& message,
                          Receiver* receiver,
                          bool* message_was_ok);
 
   // Initiates a download from the browser process (as opposed to a resource
   // request from the renderer or another child process).
   void BeginDownload(const GURL& url,
                      const GURL& referrer,
                      const DownloadSaveInfo& save_info,
+                     bool prompt_for_save_location,
                      int process_unique_id,
                      int route_id,
                      URLRequestContext* request_context);
 
   // Initiates a save file from the browser process (as opposed to a resource
   // request from the renderer or another child process).
   void BeginSaveFile(const GURL& url,
                      const GURL& referrer,
                      int process_unique_id,
                      int route_id,
@@ skipping 361 matching lines @@
   int max_outstanding_requests_cost_per_process_;
 
   // Used during IPC message dispatching so that the handlers can get a pointer
   // to the source of the message.
   Receiver* receiver_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RESOURCE_DISPATCHER_HOST_H_