Fix a bug where we access a view after deletion....

chrome/browser/download/download_shelf.cc

 // 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.
 
 #include "chrome/browser/download/download_shelf.h"
 
 #include "app/l10n_util.h"
 #include "base/file_util.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/dom_ui/downloads_ui.h"
@@ skipping 94 matching lines @@
           file_util::GetFileExtensionFromPath(download_->full_path());
       download_->manager()->OpenFilesOfExtension(
           extension, !ItemIsChecked(ALWAYS_OPEN_TYPE));
       break;
     }
     case CANCEL:
       model_->CancelTask();
       break;
     case REMOVE_ITEM:
       download_->Remove(false);
+      // |download_| has been deleted now, prevent further access to it.
+      download_ = NULL;
+      model_ = NULL;
       break;
     case TOGGLE_PAUSE:
       // It is possible for the download to complete before the user clicks the
       // menu item, recheck if the download is in progress state before toggling
       // pause.
       if (download_->state() == DownloadItem::IN_PROGRESS)
         download_->TogglePause();
       break;
     default:
       NOTREACHED();
   }
 }