Try again to land: http://codereview.chromium.org/160483

chrome/browser/download/download_manager.cc

 // Copyright (c) 2006-2009 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_manager.h"
 
 #include "app/l10n_util.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/rand_util.h"
 #include "base/stl_util-inl.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #include "base/task.h"
 #include "base/thread.h"
 #include "base/timer.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_file.h"
+#include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extensions_service.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/renderer_host/render_process_host.h"
 #include "chrome/browser/renderer_host/render_view_host.h"
 #include "chrome/browser/renderer_host/resource_dispatcher_host.h"
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 1212 matching lines @@
                         download->referrer_url());
   } else {
     OpenDownloadInShell(download, parent_window);
   }
 }
 
 void DownloadManager::OpenChromeExtension(const FilePath& full_path,
                                           const GURL& download_url,
                                           const GURL& referrer_url) {
   // We don't support extensions in OTR mode.
-  if (profile_->GetExtensionsService())
-    profile_->GetExtensionsService()->InstallExtension(full_path, download_url,
-                                                       referrer_url);
+  ExtensionsService* service = profile_->GetExtensionsService();
+  if (service) {
+    CrxInstaller::Start(full_path,
+                        service->install_directory(),
+                        Extension::INTERNAL,
+                        "",  // no expected id
+                        true,  // please delete crx on completion
+                        g_browser_process->file_thread()->message_loop(),
+                        service,
+                        new ExtensionInstallUI(profile_));
+  }
 }
 
 void DownloadManager::OpenDownloadInShell(const DownloadItem* download,
                                           gfx::NativeView parent_window) {
   DCHECK(file_manager_);
   file_loop_->PostTask(FROM_HERE,
       NewRunnableMethod(file_manager_,
                         &DownloadFileManager::OnOpenDownloadInShell,
                         download->full_path(), download->url(), parent_window));
 }
@@ skipping 250 matching lines @@
 
   if (contents)
     contents->OnStartDownload(download);
 }
 
 // Clears the last download path, used to initialize "save as" dialogs.
 void DownloadManager::ClearLastDownloadPath() {
   last_download_path_ = FilePath();
 }