Fix StreamFailBeforeReadIsExecutedOnNetworkThread flake

components/grpc_support/bidirectional_stream_unittest.cc

 // Copyright 2016 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 <stdint.h>
 #include <list>
 #include <map>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 537 matching lines @@
   test.AddWriteData("world!");
   test.read_buffer_size = 2;
   test.stream = bidirectional_stream_create(engine(), &test, test.callback());
   DCHECK(test.stream);
   bidirectional_stream_delay_request_headers_until_flush(test.stream,
                                                          GetParam());
   bidirectional_stream_start(test.stream, kTestServerUrl, 0,
                              "POST", &kTestHeadersArray, false);
   test.BlockForDone();
   ASSERT_EQ(TestBidirectionalStreamCallback::ON_FAILED, test.response_step);
-  ASSERT_EQ(net::ERR_QUIC_PROTOCOL_ERROR, test.net_error);
+  ASSERT_TRUE(test.net_error == net::ERR_QUIC_PROTOCOL_ERROR ||
+              test.net_error == net::ERR_CONNECTION_REFUSED);
   bidirectional_stream_destroy(test.stream);
 }
 
 TEST_P(BidirectionalStreamTest, WriteFailsBeforeRequestStarted) {
   TestBidirectionalStreamCallback test;
   test.stream = bidirectional_stream_create(engine(), &test, test.callback());
   DCHECK(test.stream);
   bidirectional_stream_delay_request_headers_until_flush(test.stream,
                                                          GetParam());
   bidirectional_stream_write(test.stream, "1", 1, false);
@@ skipping 78 matching lines @@
   ASSERT_EQ(TestBidirectionalStreamCallback::ON_FAILED, test.response_step);
   ASSERT_EQ(net::ERR_NAME_NOT_RESOLVED, test.net_error);
   bidirectional_stream_destroy(test.stream);
 }
 
 INSTANTIATE_TEST_CASE_P(BidirectionalStreamDelayRequestHeadersUntilFlush,
                         BidirectionalStreamTest,
                         ::testing::Values(true, false));
 
 }  // namespace grpc_support