Use IsStreamError() and friends gMock matchers in quic/core/http.

gfe-relnote: n/a, test-only change.
PiperOrigin-RevId: 282789060
Change-Id: I6af5f0076b3bea2fad005b20f741ee2db8a337ca
diff --git a/quic/core/http/quic_spdy_stream_test.cc b/quic/core/http/quic_spdy_stream_test.cc
index d7c6b93..1fefd97 100644
--- a/quic/core/http/quic_spdy_stream_test.cc
+++ b/quic/core/http/quic_spdy_stream_test.cc
@@ -364,7 +364,7 @@
   stream_->OnStreamHeaderList(false, 1 << 20, headers);
 
   if (!UsesHttp3()) {
-    EXPECT_EQ(QUIC_HEADERS_TOO_LARGE, stream_->stream_error());
+    EXPECT_THAT(stream_->stream_error(), IsStreamError(QUIC_HEADERS_TOO_LARGE));
   }
 }