Improve the UI for disabling off-store extension install.

chrome/browser/extensions/webstore_installer.cc

 // 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.
 
 #include "chrome/browser/extensions/webstore_installer.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/rand_util.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
-#include "chrome/browser/download/chrome_download_manager_delegate.h"
+#include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/download/download_util.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 252 matching lines @@
       break;
     case DownloadItem::INTERRUPTED:
       ReportFailure(kDownloadInterruptedError);
       break;
     case DownloadItem::REMOVING:
       download_item_->RemoveObserver(this);
       download_item_ = NULL;
       break;
     case DownloadItem::COMPLETE:
       // Wait for other notifications if the download is really an extension.
-      if (!ChromeDownloadManagerDelegate::IsExtensionDownload(download))
+      if (!download_crx_util::IsExtensionDownload(*download))
         ReportFailure(kInvalidDownloadError);
       break;
     default:
       // Continue listening if the download is not in one of the above states.
       break;
   }
 }
 
 void WebstoreInstaller::OnDownloadOpened(DownloadItem* download) {
   CHECK_EQ(download_item_, download);
@@ skipping 33 matching lines @@
 }
 
 void WebstoreInstaller::ReportSuccess() {
   if (delegate_) {
     delegate_->OnExtensionInstallSuccess(id_);
     delegate_ = NULL;
   }
 
   Release();  // Balanced in Start().
 }