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

net/base/net_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 NET_BASE_NET_TEST_SUITE_H_
 #define NET_BASE_NET_TEST_SUITE_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "base/test/test_suite.h"
 #include "build/build_config.h"
 #include "net/base/mock_host_resolver.h"
 
 class MessageLoop;
 
 namespace net {
 class NetworkChangeNotifier;
 }
 
 class NetTestSuite : public base::TestSuite {
  public:
   NetTestSuite(int argc, char** argv);
   virtual ~NetTestSuite();
 
   virtual void Initialize() OVERRIDE;
 
   virtual void Shutdown() OVERRIDE;
 
  protected:
+  // This constructor is only accessible to specialized net test
+  // implementations which need to control the creation of an AtExitManager
+  // instance for the duration of the test.
+  NetTestSuite(int argc, char** argv, bool create_at_exit_manager);
 
   // Called from within Initialize(), but separate so that derived classes
   // can initialize the NetTestSuite instance only and not
   // TestSuite::Initialize().  TestSuite::Initialize() performs some global
   // initialization that can only be done once.
   void InitializeTestThread();
 
   // Same as above, except it does not create a mock
   // NetworkChangeNotifier.  Use this if your test needs to create and
   // manage its own mock NetworkChangeNotifier, or if your test uses
   // the production NetworkChangeNotifier.
   void InitializeTestThreadNoNetworkChangeNotifier();
 
  private:
   scoped_ptr<net::NetworkChangeNotifier> network_change_notifier_;
   scoped_ptr<MessageLoop> message_loop_;
   scoped_refptr<net::RuleBasedHostResolverProc> host_resolver_proc_;
   net::ScopedDefaultHostResolverProc scoped_host_resolver_proc_;
 };
 
 #endif  // NET_BASE_NET_TEST_SUITE_H_