Remove some unnecessary using directives from tests.

net/tools/quic/quic_spdy_client_stream_test.cc

Index: net/tools/quic/quic_spdy_client_stream_test.cc
diff --git a/net/tools/quic/quic_spdy_client_stream_test.cc b/net/tools/quic/quic_spdy_client_stream_test.cc
index 1c3223f3f9f0d9d6b97f02ea62dc76e9897cf019..785025a4a310293929c87ff35cdcfbb8b56b4e38 100644
--- a/net/tools/quic/quic_spdy_client_stream_test.cc
+++ b/net/tools/quic/quic_spdy_client_stream_test.cc
@@ -18,16 +18,6 @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::IntToString;
-using net::test::CryptoTestUtils;
-using net::test::DefaultQuicConfig;
-using net::test::MockQuicConnection;
-using net::test::MockQuicConnectionHelper;
-using net::test::SupportedVersions;
-using net::test::kClientDataStreamId1;
-using net::test::kServerDataStreamId1;
-using net::test::kInitialSessionFlowControlWindowForTest;
-using net::test::kInitialStreamFlowControlWindowForTest;
-
 using std::string;
 using testing::StrictMock;
 using testing::TestWithParam;