[Download Notification] Refine retry logic when interrupted or cancelled

chrome/browser/download/download_commands.h

 // Copyright 2015 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_COMMANDS_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_COMMANDS_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/ui/browser.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/page_navigator.h"
 #include "ui/gfx/image/image.h"
 
 class DownloadCommands {
  public:
   enum Command {
     SHOW_IN_FOLDER = 1,   // Open a folder view window with the item selected.
     OPEN_WHEN_COMPLETE,   // Open the download when it's finished.
     ALWAYS_OPEN_TYPE,     // Default this file extension to always open.
     PLATFORM_OPEN,        // Open using platform handler.
     CANCEL,               // Cancel the download.
     PAUSE,                // Pause a download.
     RESUME,               // Resume a download.
     DISCARD,              // Discard the malicious download.
     KEEP,                 // Keep the malicious download.
-    RETRY,                // Retry the download.
     LEARN_MORE_SCANNING,  // Show information about download scanning.
     LEARN_MORE_INTERRUPTED,  // Show information about interrupted downloads.
   };
 
   // |download_item| must outlive DownloadCommands.
   explicit DownloadCommands(content::DownloadItem* download_item);
   virtual ~DownloadCommands() {}
 
   gfx::Image GetCommandIcon(Command command);
 
@@ skipping 14 matching lines @@
       GetLearnMoreURLForInterruptedDownload_ContainsContext);
 
   Browser* GetBrowser() const;
   int GetCommandIconId(Command command) const;
   GURL GetLearnMoreURLForInterruptedDownload() const;
 
   content::DownloadItem* const download_item_;
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_COMMANDS_H_