Remove URLRequestJob::GetResponseCode implementations outside of net/.

extensions/browser/extension_protocols.cc

Index: extensions/browser/extension_protocols.cc
diff --git a/extensions/browser/extension_protocols.cc b/extensions/browser/extension_protocols.cc
index ef0c65a5eb69b7396123bb41f469e7e38aeef68d..1c9e2a6cbb72c3cfd617108c27e08a15dd8250c0 100644
--- a/extensions/browser/extension_protocols.cc
+++ b/extensions/browser/extension_protocols.cc
@@ -202,10 +202,6 @@ class URLRequestExtensionJob : public net::URLRequestFileJob {
     *info = response_info_;
   }
 
-  // This always returns 200 because a URLRequestExtensionJob will only get
-  // created in MaybeCreateJob() if the file exists.
-  int GetResponseCode() const override { return 200; }
-
   void Start() override {
     request_timer_.reset(new base::ElapsedTimer());
     base::FilePath* read_file_path = new base::FilePath;