Give URLRequestJob::GetResponseCode a better default implementation.

net/test/url_request/url_request_mock_data_job.cc

Index: net/test/url_request/url_request_mock_data_job.cc
diff --git a/net/test/url_request/url_request_mock_data_job.cc b/net/test/url_request/url_request_mock_data_job.cc
index 8b67a984a53becae9f1957f92219e85a12c23b8c..c57fbfbaf3f452186e45568385f46ca05e8f059c 100644
--- a/net/test/url_request/url_request_mock_data_job.cc
+++ b/net/test/url_request/url_request_mock_data_job.cc
@@ -127,12 +127,6 @@ int URLRequestMockDataJob::ReadRawData(IOBuffer* buf, int buf_size) {
   return bytes_read;
 }
 
-int URLRequestMockDataJob::GetResponseCode() const {
-  HttpResponseInfo info;
-  GetResponseInfoConst(&info);
-  return info.headers->response_code();
-}
-
 void URLRequestMockDataJob::ContinueWithCertificate(
     X509Certificate* client_cert,
     SSLPrivateKey* client_private_key) {