downloads: clicking "remove" on chrome://downloads should also hide shelf item.

chrome/browser/download/download_shelf.h

 // Copyright (c) 2012 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 "base/callback_forward.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
@@ skipping 117 matching lines @@
 
   // A new download has started. Add it to our shelf and show the download
   // started animation.
   //
   // Some downloads are removed from the shelf on completion (See
   // DownloadItemModel::ShouldRemoveFromShelfWhenComplete()). These transient
   // downloads are added to the shelf after a delay. If the download completes
   // before the delay duration, it will not be added to the shelf at all.
   void AddDownload(content::DownloadItem* download);
 
+  // Remove |download| from our shelf if it exists.
+  //
+  // NOTE: This call is only necessary if |download| needs to be hidden but
+  // isn't actually being deleted. For example: a download is visually hidden
+  // from chrome://downloads but isn't deleted until the page closes (so the
+  // removal can be undone).
+  //
+  // To really remove a download from all views and delete any intermediate
+  // files, call DownloadItem::Remove().
+  virtual void RemoveDownload(content::DownloadItem* download) = 0;
+
   // The browser view needs to know when we are going away to properly return
   // the resize corner size to WebKit so that we don't draw on top of it.
   // This returns the showing state of our animation which is set to true at
   // the beginning Show and false at the beginning of a Hide.
   virtual bool IsShowing() const = 0;
 
   // Returns whether the download shelf is showing the close animation.
   virtual bool IsClosing() const = 0;
 
   // Opens the shelf.
@@ skipping 37 matching lines @@
   // download should belong to the DownloadManager returned by
   // GetDownloadManager().
   void ShowDownloadById(int32 download_id);
 
   bool should_show_on_unhide_;
   bool is_hidden_;
   base::WeakPtrFactory<DownloadShelf> weak_ptr_factory_;
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SHELF_H_