Add a new QuicFlagSaver class for saving/restoring the values of QUIC flags in tests.

net/tools/quic/quic_simple_server_session_test.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/quic/quic_simple_server_session.h"
 
 #include <algorithm>
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 25 matching lines @@
 using net::test::MockQuicConnection;
 using net::test::MockQuicConnectionHelper;
 using net::test::QuicConfigPeer;
 using net::test::QuicConnectionPeer;
 using net::test::QuicSpdyStreamPeer;
 using net::test::QuicSentPacketManagerPeer;
 using net::test::QuicSessionPeer;
 using net::test::QuicSpdySessionPeer;
 using net::test::QuicSustainedBandwidthRecorderPeer;
 using net::test::SupportedVersions;
-using net::test::ValueRestore;
 using net::test::kClientDataStreamId1;
 using net::test::kClientDataStreamId2;
 using net::test::kClientDataStreamId3;
 using net::test::kInitialSessionFlowControlWindowForTest;
 using net::test::kInitialStreamFlowControlWindowForTest;
 using std::string;
 using testing::StrictMock;
 using testing::_;
 using testing::InSequence;
 using testing::Return;
@@ skipping 563 matching lines @@
       .WillOnce(Return(QuicConsumedData(kStreamFlowControlWindowSize, false)));
 
   EXPECT_CALL(*connection_, SendBlocked(stream_to_open));
   QuicRstStreamFrame rst(stream_got_reset, QUIC_STREAM_CANCELLED, 0);
   visitor_->OnRstStream(rst);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net