Don't rely on SSL cipher fallback in proxy auth.

net/http/http_network_transaction_unittest.cc

Index: net/http/http_network_transaction_unittest.cc
diff --git a/net/http/http_network_transaction_unittest.cc b/net/http/http_network_transaction_unittest.cc
index e95ab37faf515ae8e47324e982447d4dc341c9ca..723cf04dc08a0f95e87a22918c60c1555b81e90c 100644
--- a/net/http/http_network_transaction_unittest.cc
+++ b/net/http/http_network_transaction_unittest.cc
@@ -12295,6 +12295,7 @@ TEST_F(HttpNetworkTransactionTest, GenerateAuthToken) {
     std::vector<std::vector<MockRead>> mock_reads(1);
     std::vector<std::vector<MockWrite>> mock_writes(1);
     for (int round = 0; round < test_config.num_auth_rounds; ++round) {
+      SCOPED_TRACE(round);
       const TestRound& read_write_round = test_config.rounds[round];
 
       // Set up expected reads and writes.
@@ -12335,6 +12336,7 @@ TEST_F(HttpNetworkTransactionTest, GenerateAuthToken) {
     HttpNetworkTransaction trans(DEFAULT_PRIORITY, session.get());
 
     for (int round = 0; round < test_config.num_auth_rounds; ++round) {
+      SCOPED_TRACE(round);
       const TestRound& read_write_round = test_config.rounds[round];
       // Start or restart the transaction.
       TestCompletionCallback callback;