Move Extension into extensions namespace

chrome/browser/extensions/alert_apitest.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 "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/app_modal_dialogs/app_modal_dialog.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/render_view_host.h"
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, AlertBasic) {
   ASSERT_TRUE(RunExtensionTest("alert")) << message_;
 
-  const Extension* extension = GetSingleLoadedExtension();
+  const extensions::Extension* extension = GetSingleLoadedExtension();
   ExtensionHost* host = browser()->profile()->GetExtensionProcessManager()->
       GetBackgroundHostForExtension(extension->id());
   ASSERT_TRUE(host);
   host->render_view_host()->ExecuteJavascriptInWebFrame(string16(),
       ASCIIToUTF16("alert('This should not crash.');"));
 
   AppModalDialog* alert = ui_test_utils::WaitForAppModalDialog();
   ASSERT_TRUE(alert);
   alert->CloseModalDialog();
 }