Remove now useless QUIC method AdjustErrorForVersion() which has been a no-op for some time.

net/tools/quic/quic_client_session_test.cc

Index: net/tools/quic/quic_client_session_test.cc
diff --git a/net/tools/quic/quic_client_session_test.cc b/net/tools/quic/quic_client_session_test.cc
index 75d02cb8eea179e127c2aac3f36c321398d48080..937ce68f319a47b63f7e780aa9340c7ff47152d9 100644
--- a/net/tools/quic/quic_client_session_test.cc
+++ b/net/tools/quic/quic_client_session_test.cc
@@ -233,9 +233,8 @@ TEST_P(QuicClientSessionTest, MaxNumStreamsWithRst) {
 
   // Close the stream and receive an RST frame to remove the unfinished stream
   session_->CloseStream(stream->id());
-  session_->OnRstStream(QuicRstStreamFrame(
-      stream->id(), AdjustErrorForVersion(QUIC_RST_ACKNOWLEDGEMENT, GetParam()),
-      0));
+  session_->OnRstStream(
+      QuicRstStreamFrame(stream->id(), QUIC_RST_ACKNOWLEDGEMENT, 0));
   // Check that a new one can be created.
   EXPECT_EQ(0u, session_->GetNumOpenOutgoingStreams());
   stream = session_->CreateOutgoingDynamicStream(kDefaultPriority);