Remove URLRequestJob::GetResponseCode implementations from some tests.

chrome/browser/predictors/resource_prefetch_predictor_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/predictors/resource_prefetch_predictor.h"
 
 #include <iostream>
 #include <memory>
 #include <utility>
 
@@ skipping 52 matching lines @@
         response_info_(response_info),
         mime_type_(mime_type) {}
 
   bool GetMimeType(std::string* mime_type) const override {
     *mime_type = mime_type_;
     return true;
   }
 
  protected:
   void Start() override { NotifyHeadersComplete(); }
-  int GetResponseCode() const override { return 200; }
   void GetResponseInfo(net::HttpResponseInfo* info) override {
     *info = response_info_;
   }
 
  private:
   net::HttpResponseInfo response_info_;
   std::string mime_type_;
 };
 
 class MockURLRequestJobFactory : public net::URLRequestJobFactory {
@@ skipping 1513 matching lines @@
   predictor_->RecordMainFrameLoadComplete(main_frame.navigation_id);
   profile_->BlockUntilHistoryProcessesPendingRequests();
 
   histogram_tester_->ExpectBucketCount(
       internal::kResourcePrefetchPredictorRecallHistogram, 50, 1);
   histogram_tester_->ExpectBucketCount(
       internal::kResourcePrefetchPredictorPrecisionHistogram, 33, 1);
 }
 
 }  // namespace predictors