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

net/base/net_test_suite.h

Index: net/base/net_test_suite.h
===================================================================
--- net/base/net_test_suite.h	(revision 114331)
+++ net/base/net_test_suite.h	(working copy)
@@ -27,6 +27,10 @@
   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