Allows deferral of a URLRequest just before talking to the network, at

net/http/http_transaction_unittest.cc

Index: net/http/http_transaction_unittest.cc
diff --git a/net/http/http_transaction_unittest.cc b/net/http/http_transaction_unittest.cc
index 757ee76ca91738cc1059875dd6efaa37442316fd..5d40dad0a4696a7d38937f74aac66a559d3107b2 100644
--- a/net/http/http_transaction_unittest.cc
+++ b/net/http/http_transaction_unittest.cc
@@ -412,6 +412,15 @@ int MockNetworkTransaction::StartInternal(
   return net::ERR_IO_PENDING;
 }
 
+void MockNetworkTransaction::SetBeforeNetworkStartCallback(
+    const base::Callback<void(bool*)>& callback) {
+}
+
+int MockNetworkTransaction::ResumeNetworkStart() {
+  // should not get here
+  return net::ERR_FAILED;
+}
+
 void MockNetworkTransaction::CallbackLater(
     const net::CompletionCallback& callback, int result) {
   base::MessageLoop::current()->PostTask(