[Extensions] Introduce a ScopedExtensionDialogAutoConfirm

chrome/browser/extensions/webstore_installer_test.cc

 // Copyright 2013 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/command_line.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/extensions/tab_helper.h"
@@ skipping 120 matching lines @@
 
 void WebstoreInstallerTest::RunTestAsync(
     const std::string& test_function_name) {
   std::string script = base::StringPrintf(
       "%s('%s')", test_function_name.c_str(), test_gallery_url_.c_str());
   browser()->tab_strip_model()->GetActiveWebContents()->GetMainFrame()->
       ExecuteJavaScriptWithUserGestureForTests(base::UTF8ToUTF16(script));
 }
 
 void WebstoreInstallerTest::AutoAcceptInstall() {
-  ExtensionInstallPrompt::g_auto_confirm_for_tests =
-      ExtensionInstallPrompt::ACCEPT;
+  install_auto_confirm_.reset();  // Destroy any old override first.
+  install_auto_confirm_.reset(new extensions::ScopedTestDialogAutoConfirm(
+      extensions::ScopedTestDialogAutoConfirm::ACCEPT));
 }
 
 void WebstoreInstallerTest::AutoCancelInstall() {
-  ExtensionInstallPrompt::g_auto_confirm_for_tests =
-      ExtensionInstallPrompt::CANCEL;
+  install_auto_confirm_.reset();  // Destroy any old override first.
+  install_auto_confirm_.reset(new extensions::ScopedTestDialogAutoConfirm(
+      extensions::ScopedTestDialogAutoConfirm::CANCEL));
 }