Enable ChromeFrame net tests for IE versions 8 and below. Changes include the following:-

base/test/test_suite.h

 // Copyright (c) 2011 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.
 
 #ifndef BASE_TEST_TEST_SUITE_H_
 #define BASE_TEST_TEST_SUITE_H_
 #pragma once
 
 // Defines a basic test suite framework for running gtest based tests.  You can
 // instantiate this class in your main function and call its Run method to run
@@ skipping 57 matching lines @@
   virtual void SuppressErrorDialogs();
 
   // Override these for custom initialization and shutdown handling.  Use these
   // instead of putting complex code in your constructor/destructor.
 
   virtual void Initialize();
   virtual void Shutdown();
 
   // Make sure that we setup an AtExitManager so Singleton objects will be
   // destroyed.
-  base::AtExitManager at_exit_manager_;
+  base::ShadowingAtExitManager at_exit_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSuite);
 };
 
 }  // namespace base
 
 // TODO(brettw) remove this. This is a temporary hack to allow WebKit to compile
 // until we can update it to use "base::" (preventing a two-sided patch).
 using base::TestSuite;
 
 #endif  // BASE_TEST_TEST_SUITE_H_