Use the kClientDataStreamId1 constant instead of hardcoded "5"

net/tools/quic/quic_spdy_server_stream_test.cc

Index: net/tools/quic/quic_spdy_server_stream_test.cc
diff --git a/net/tools/quic/quic_spdy_server_stream_test.cc b/net/tools/quic/quic_spdy_server_stream_test.cc
index 4798fc5dfb535defaf79ad25d6bd41dd0cf3407f..198f39facda4a467fbb5f8fd56d504d9d53f509a 100644
--- a/net/tools/quic/quic_spdy_server_stream_test.cc
+++ b/net/tools/quic/quic_spdy_server_stream_test.cc
@@ -103,7 +103,8 @@ class QuicSpdyServerStreamTest : public ::testing::TestWithParam<QuicVersion> {
         kInitialStreamFlowControlWindowForTest);
     session_.config()->SetInitialSessionFlowControlWindowToSend(
         kInitialSessionFlowControlWindowForTest);
-    stream_ = new QuicSpdyServerStreamPeer(5, &session_);
+    stream_ = new QuicSpdyServerStreamPeer(::net::test::kClientDataStreamId1,
+                                           &session_);
     // Register stream_ in dynamic_stream_map_ and pass ownership to session_.
     session_.ActivateStream(stream_);