Add a ExtensionBrowserTest base class

chrome/browser/renderer_host/render_view_host_manager_browsertest.cc

 // Copyright (c) 2009 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/browser.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/browser/download/download_manager.h"
 #include "chrome/browser/profile.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 31 matching lines @@
   ui_test_utils::NavigateToURL(browser(), downloads_url);
   ui_test_utils::NavigateToURL(browser(), zip_url);
   ui_test_utils::WaitForDownloadCount(
       browser()->profile()->GetDownloadManager(), 1);
   ui_test_utils::NavigateToURL(browser(), extensions_url);
 
   TabContents *contents = browser()->GetSelectedTabContents();
   ASSERT_TRUE(contents);
   bool domui_responded = false;
   EXPECT_TRUE(ui_test_utils::ExecuteJavaScriptAndExtractBool(
-      contents,
+      contents->render_view_host(),
       L"",
       L"window.domAutomationController.send(window.domui_responded_);",
       &domui_responded));
   EXPECT_TRUE(domui_responded);
 }
 
 class BrowserClosedObserver : public NotificationObserver {
  public:
   explicit BrowserClosedObserver(Browser* browser) {
     registrar_.Add(this, NotificationType::BROWSER_CLOSED,
@@ skipping 40 matching lines @@
       &result));
   EXPECT_TRUE(result);
   ui_test_utils::NavigateToURL(browser(), zip_url);
 
   ui_test_utils::WaitForDownloadCount(
     browser()->profile()->GetDownloadManager(), 1);
 
   browser()->CloseWindow();
   BrowserClosedObserver wait_for_close(browser());
 }