Add a group policy controlling which sites can install extensions.

chrome/browser/extensions/crx_installer_browsertest.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/download/download_crx_util.h"
 #include "chrome/browser/download/download_service.h"
 #include "chrome/browser/download/download_service_factory.h"
 #include "chrome/browser/download/download_test_observer.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
@@ skipping 179 matching lines @@
 IN_PROC_BROWSER_TEST_F(ExtensionCrxInstallerTest, MAYBE_AllowOffStore) {
   ExtensionService* service = browser()->profile()->GetExtensionService();
   const bool kTestData[] = {false, true};
 
   for (size_t i = 0; i < arraysize(kTestData); ++i) {
     MockInstallUI* mock_ui = new MockInstallUI(browser()->profile());
     scoped_refptr<CrxInstaller> crx_installer(
         CrxInstaller::Create(service, mock_ui));
     crx_installer->set_install_cause(
         extension_misc::INSTALL_CAUSE_USER_DOWNLOAD);
-    crx_installer->set_allow_off_store_install(kTestData[i]);
+
+    if (kTestData[i]) {
+      crx_installer->set_off_store_install_allow_reason(
+          CrxInstaller::OffStoreInstallAllowedInTest);
+    }
 
     crx_installer->InstallCrx(test_data_dir_.AppendASCII("good.crx"));
     EXPECT_EQ(kTestData[i], WaitForExtensionInstall()) << kTestData[i];
     EXPECT_EQ(kTestData[i], mock_ui->did_succeed());
     EXPECT_EQ(kTestData[i], mock_ui->confirmation_requested()) << kTestData[i];
     if (kTestData[i]) {
       EXPECT_EQ(string16(), mock_ui->error()) << kTestData[i];
     } else {
       EXPECT_EQ(l10n_util::GetStringUTF16(
           IDS_EXTENSION_INSTALL_DISALLOWED_ON_SITE),
           mock_ui->error()) << kTestData[i];
     }
   }
 }