Split the private webstore install API into two parts....

chrome/browser/extensions/extension_gallery_install_apitest.cc

 // Copyright (c) 2010 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 "base/stringprintf.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_webstore_private_api.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/ui_test_utils.h"
 #include "net/base/mock_host_resolver.h"
@@ skipping 15 matching lines @@
 #endif
 IN_PROC_BROWSER_TEST_F(ExtensionGalleryInstallApiTest,
                        MAYBE_InstallAndUninstall) {
   host_resolver()->AddRule("www.example.com", "127.0.0.1");
   ASSERT_TRUE(test_server()->Start());
 
   std::string base_url = base::StringPrintf(
       "http://www.example.com:%u/files/extensions/",
       test_server()->host_port_pair().port());
 
+  BeginInstallFunction::SetIgnoreUserGestureForTests(true);
   std::string testing_install_base_url = base_url;
   testing_install_base_url += "good.crx";
-  InstallFunction::SetTestingInstallBaseUrl(testing_install_base_url.c_str());
+  CompleteInstallFunction::SetTestingInstallBaseUrl(
+      testing_install_base_url.c_str());
 
   std::string page_url = base_url;
   page_url += "api_test/extension_gallery_install/test.html";
   ASSERT_TRUE(RunPageTest(page_url.c_str()));
+
+  page_url = base_url;
+  page_url += "api_test/extension_gallery_install/test.html?expect_error=true";
+  BeginInstallFunction::SetIgnoreUserGestureForTests(false);
+  ASSERT_TRUE(RunPageTest(page_url.c_str()));
 }