Remove URLRequestJob::GetResponseCode implementations from chrome/

chrome/browser/predictors/resource_prefetch_predictor_unittest.cc

Index: chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
diff --git a/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc b/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
index d9b6f670c51be936a27f2658ed41868c08b207ad..0a517a08ed7836dbae6e33984923377985f5f20c 100644
--- a/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
+++ b/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
@@ -71,7 +71,6 @@ class MockURLRequestJob : public net::URLRequestJob {
 
  protected:
   void Start() override { NotifyHeadersComplete(); }
-  int GetResponseCode() const override { return 200; }
   void GetResponseInfo(net::HttpResponseInfo* info) override {
     *info = response_info_;
   }