Mac: make save/open dialogs operate as tab-modal sheets....

chrome/browser/download/download_request_manager.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_MANAGER_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_MANAGER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 71 matching lines @@
       status_ = status;
     }
     DownloadRequestManager::DownloadStatus download_status() const {
       return status_;
     }
 
     // Invoked when a user gesture occurs (mouse click, enter or space). This
     // may result in invoking Remove on DownloadRequestManager.
     void OnUserGesture();
 
-    // Asks the user if they really want to allow the download.
+    // Asks the user if they really want to allow the download. Returns |false|
+    // on error (|true| otherwise).
     // See description above CanDownloadOnIOThread for details on lifetime of
     // callback.
-    void PromptUserForDownload(TabContents* tab,
+    bool PromptUserForDownload(TabContents* tab,
                                DownloadRequestManager::Callback* callback);
 
     // Are we showing a prompt to the user?
     bool is_showing_prompt() const { return (dialog_delegate_ != NULL); }
 
     // NavigationController we're tracking.
     NavigationController* controller() const { return controller_; }
 
     // Invoked from DownloadRequestDialogDelegate. Notifies the delegates and
     // changes the status appropriately.
@@ skipping 112 matching lines @@
   // the TabDownloadState is removed and deleted (by way of Remove).
   typedef std::map<NavigationController*, TabDownloadState*> StateMap;
   StateMap state_map_;
 
   static TestingDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadRequestManager);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_MANAGER_H_