webRequest.onAuthRequired listeners can provide authentication credentials.

net/url_request/url_request_test_util.cc

Index: net/url_request/url_request_test_util.cc
diff --git a/net/url_request/url_request_test_util.cc b/net/url_request/url_request_test_util.cc
index f49d0c4da21082580bebf66bfb319c3067ffe543..ab3bb46b6749ece81a219f8af7a2247775acd2bb 100644
--- a/net/url_request/url_request_test_util.cc
+++ b/net/url_request/url_request_test_util.cc
@@ -457,7 +457,10 @@ void TestNetworkDelegate::OnPACScriptError(int line_number,
                                            const string16& error) {
 }
 
-void TestNetworkDelegate::OnAuthRequired(
+int TestNetworkDelegate::OnAuthRequired(
     net::URLRequest* reqest,
-    const net::AuthChallengeInfo& auth_info) {
+    const net::AuthChallengeInfo& auth_info,
+    net::CompletionCallback* callback,
+    net::AuthCredentials* credentials) {
+  return net::OK;
 }