Do not use union in QuicErrorCodeToIetfMapping.  Also do not end public member names with underscore.

gfe-relnote: n/a, refactor only, no functional change.
PiperOrigin-RevId: 305801835
Change-Id: I54133a221239075b203892db7f9686d442f5b7c5
diff --git a/quic/core/quic_connection_test.cc b/quic/core/quic_connection_test.cc
index e887669..2f161b5 100644
--- a/quic/core/quic_connection_test.cc
+++ b/quic/core/quic_connection_test.cc
@@ -1683,19 +1683,16 @@
     QuicErrorCodeToIetfMapping mapping =
         QuicErrorCodeToTransportErrorCode(expected_code);
 
-    if (mapping.is_transport_close_) {
+    if (mapping.is_transport_close) {
       // This Google QUIC Error Code maps to a transport close,
       EXPECT_EQ(IETF_QUIC_TRANSPORT_CONNECTION_CLOSE,
                 connection_close_frames[0].close_type);
-      EXPECT_EQ(mapping.transport_error_code_,
-                connection_close_frames[0].wire_error_code);
     } else {
       // This maps to an application close.
       EXPECT_EQ(IETF_QUIC_APPLICATION_CONNECTION_CLOSE,
                 connection_close_frames[0].close_type);
-      EXPECT_EQ(mapping.application_error_code_,
-                connection_close_frames[0].wire_error_code);
     }
+    EXPECT_EQ(mapping.error_code, connection_close_frames[0].wire_error_code);
   }
 
   void MtuDiscoveryTestInit() {