Add "Remove from list" for download item in the download shelf....

chrome/browser/download/download_shelf.h

 // Copyright (c) 2009 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_SHELF_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SHELF_H_
 
 #include <string>
 
 #include "base/logging.h"
@@ skipping 33 matching lines @@
 // Logic for the download shelf context menu. Platform specific subclasses are
 // responsible for creating and running the menu.
 class DownloadShelfContextMenu {
  public:
   virtual ~DownloadShelfContextMenu();
 
  protected:
   explicit DownloadShelfContextMenu(BaseDownloadItemModel* download_model);
 
   enum ContextMenuCommands {
-    SHOW_IN_FOLDER = 1,  // Open a file explorer 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
-    CANCEL,              // Cancel the download
+    SHOW_IN_FOLDER = 1,  // Open a file explorer 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.
+    CANCEL,              // Cancel the download.
+    REMOVE_ITEM,         // Removes the item from the download shelf.
     MENU_LAST
   };
 
  protected:
   bool ItemIsChecked(int id) const;
   bool ItemIsDefault(int id) const;
   std::wstring GetItemLabel(int id) const;
   bool IsItemCommandEnabled(int id) const;
   void ExecuteItemCommand(int id);
 
   // Information source.
   DownloadItem* download_;
 
   // A model to control the cancel behavior.
   BaseDownloadItemModel* model_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DownloadShelfContextMenu);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SHELF_H_