Fix two URLRequestJob subclasses that didn't support cancellation

net/url_request/url_request_error_job.cc

Index: net/url_request/url_request_error_job.cc
diff --git a/net/url_request/url_request_error_job.cc b/net/url_request/url_request_error_job.cc
index efbf4247d3122c86ec88ee450f5f51a1a418c11b..e5bd2d72dcadbfc20fd1ed66050f639d4f5e1a6f 100644
--- a/net/url_request/url_request_error_job.cc
+++ b/net/url_request/url_request_error_job.cc
@@ -28,6 +28,11 @@ void URLRequestErrorJob::Start() {
       base::Bind(&URLRequestErrorJob::StartAsync, weak_factory_.GetWeakPtr()));
 }
 
+void URLRequestErrorJob::Kill() {
+  URLRequestJob::Kill();
+  weak_factory_.InvalidateWeakPtrs();
+}
+
 void URLRequestErrorJob::StartAsync() {
   NotifyStartError(URLRequestStatus(URLRequestStatus::FAILED, error_));
 }