Add a ExtensionBrowserTest base class

chrome/test/in_process_browser_test.cc

 // Copyright (c) 2006-2008 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/test/in_process_browser_test.h"
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
@@ skipping 200 matching lines @@
   CHECK(PathService::Override(base::FILE_EXE, chrome_path));
 
   browser_ = CreateBrowser(profile);
 
   // Start the timeout timer to prevent hangs.
   MessageLoopForUI::current()->PostDelayedTask(FROM_HERE,
       NewRunnableMethod(this, &InProcessBrowserTest::TimedOut),
       kInitialTimeoutInMS);
 
   RunTestOnMainThread();
+  CleanUpOnMainThread();
 
   BrowserList::const_iterator browser = BrowserList::begin();
   for (; browser != BrowserList::end(); ++browser)
     (*browser)->CloseAllTabs();
 
   // Stop the HTTP server.
   http_server_ = NULL;
 
   MessageLoopForUI::current()->Quit();
 }
@@ skipping 11 matching lines @@
 
   GTEST_NONFATAL_FAILURE_("Timed-out");
 
   // Start the timeout timer to prevent hangs.
   MessageLoopForUI::current()->PostDelayedTask(FROM_HERE,
       NewRunnableMethod(this, &InProcessBrowserTest::TimedOut),
       kSubsequentTimeoutInMS);
 
   MessageLoopForUI::current()->Quit();
 }