Add the --disable-off-store-extension-install switch.

chrome/browser/download/download_crx_util.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.
 //
 // Download code which handles CRX files (extensions, themes, apps, ...).
 
 #include "chrome/browser/download/download_util.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/webstore_installer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/extensions/switch_utils.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/notification_service.h"
 
 using content::BrowserThread;
 using content::DownloadItem;
 
 namespace download_crx_util {
 
 namespace {
 
@@ skipping 19 matching lines @@
 }
 
 }  // namespace
 
 // Tests can call this method to inject a mock ExtensionInstallUI
 // to be used to confirm permissions on a downloaded CRX.
 void SetMockInstallUIForTesting(ExtensionInstallUI* mock_ui) {
   mock_install_ui_for_testing = mock_ui;
 }
 
+bool ShouldOpenExtensionDownload(const DownloadItem& download_item) {
+  if (extensions::switch_utils::IsOffStoreInstallEnabled() ||
+      WebstoreInstaller::GetAssociatedApproval(download_item)) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
 scoped_refptr<CrxInstaller> OpenChromeExtension(
     Profile* profile,
     const DownloadItem& download_item) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   ExtensionService* service = profile->GetExtensionService();
   CHECK(service);
 
   scoped_refptr<CrxInstaller> installer(
       CrxInstaller::Create(
@@ skipping 17 matching lines @@
       installer->set_original_download_url(download_item.GetOriginalUrl());
     installer->set_allow_silent_install(is_gallery_download);
     installer->set_install_cause(extension_misc::INSTALL_CAUSE_USER_DOWNLOAD);
     installer->InstallCrx(download_item.GetFullPath());
   }
 
   return installer;
 }
 
 }  // namespace download_crx_util