Give URLRequestJob::GetResponseCode a better default implementation.

net/test/url_request/url_request_failed_job.h

Index: net/test/url_request/url_request_failed_job.h
diff --git a/net/test/url_request/url_request_failed_job.h b/net/test/url_request/url_request_failed_job.h
index 0c11c66dc8690210e6da4d16b600a2cd24ba5480..1e2695c2983f6fd4ef31da4a1b0f62602aa1d49c 100644
--- a/net/test/url_request/url_request_failed_job.h
+++ b/net/test/url_request/url_request_failed_job.h
@@ -41,7 +41,6 @@ class URLRequestFailedJob : public URLRequestJob {
   // URLRequestJob implementation:
   void Start() override;
   int ReadRawData(IOBuffer* buf, int buf_size) override;
-  int GetResponseCode() const override;
   void GetResponseInfo(HttpResponseInfo* info) override;
   void PopulateNetErrorDetails(NetErrorDetails* details) const override;
   int64_t GetTotalReceivedBytes() const override;