Use IsStreamError() and friends gMock matchers in a few tests.

gfe-relnote: n/a, test-only change.
PiperOrigin-RevId: 282776774
Change-Id: I5a8ac676cbc01c9999115f2d8f1ba54cfb28d1cb
diff --git a/quic/quic_transport/quic_transport_integration_test.cc b/quic/quic_transport/quic_transport_integration_test.cc
index dfccb14..715bd9f 100644
--- a/quic/quic_transport/quic_transport_integration_test.cc
+++ b/quic/quic_transport/quic_transport_integration_test.cc
@@ -226,10 +226,10 @@
   EXPECT_FALSE(server_->session()->IsSessionReady());
   EXPECT_FALSE(client_->session()->connection()->connected());
   EXPECT_FALSE(server_->session()->connection()->connected());
-  EXPECT_EQ(client_->session()->error(),
-            QUIC_TRANSPORT_INVALID_CLIENT_INDICATION);
-  EXPECT_EQ(server_->session()->error(),
-            QUIC_TRANSPORT_INVALID_CLIENT_INDICATION);
+  EXPECT_THAT(client_->session()->error(),
+              IsError(QUIC_TRANSPORT_INVALID_CLIENT_INDICATION));
+  EXPECT_THAT(server_->session()->error(),
+              IsError(QUIC_TRANSPORT_INVALID_CLIENT_INDICATION));
 }
 
 TEST_F(QuicTransportIntegrationTest, SendOutgoingStreams) {