Clean up net unit testing code.

net/http/http_auth_unittest.cc

Index: net/http/http_auth_unittest.cc
diff --git a/net/http/http_auth_unittest.cc b/net/http/http_auth_unittest.cc
index f45d215fa3e549c5d71520148ec0e371b60b70af..6788be223801f3fa090db354619a89f6764cba24 100644
--- a/net/http/http_auth_unittest.cc
+++ b/net/http/http_auth_unittest.cc
@@ -17,6 +17,7 @@
 #include "net/http/http_auth_handler_mock.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_util.h"
+#include "net/http/mock_allow_url_security_manager.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
@@ -115,7 +116,7 @@ TEST(HttpAuthTest, ChooseBestChallenge) {
   };
   GURL origin("http://www.example.com");
   std::set<HttpAuth::Scheme> disabled_schemes;
-  URLSecurityManagerAllow url_security_manager;
+  MockAllowURLSecurityManager url_security_manager;
   scoped_ptr<HostResolver> host_resolver(new MockHostResolver());
   scoped_ptr<HttpAuthHandlerRegistryFactory> http_auth_handler_factory(
       HttpAuthHandlerFactory::CreateDefault(host_resolver.get()));