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

net/tools/quic/quic_time_wait_list_manager_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_time_wait_list_manager.h"
 
 #include <errno.h>
 #include <memory>
 
 #include "net/quic/core/crypto/crypto_protocol.h"
@@ skipping 12 matching lines @@
 #include "net/tools/quic/test_tools/mock_epoll_server.h"
 #include "net/tools/quic/test_tools/mock_quic_server_session_visitor.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using net::test::kTestPort;
 using net::test::BuildUnsizedDataPacket;
 using net::test::NoOpFramerVisitor;
 using net::test::QuicVersionMax;
 using net::test::QuicVersionMin;
-using net::test::ValueRestore;
 using net::test::MockPacketWriter;
 
 using testing::Args;
 using testing::Assign;
 using testing::DoAll;
 using testing::Matcher;
 using testing::MatcherInterface;
 using testing::NiceMock;
 using testing::Return;
 using testing::ReturnPointee;
@@ skipping 506 matching lines @@
     EXPECT_EQ(static_cast<size_t>(FLAGS_quic_time_wait_list_max_connections),
               time_wait_list_manager_.num_connections());
     EXPECT_FALSE(IsConnectionIdInTimeWait(id_to_evict));
     EXPECT_TRUE(IsConnectionIdInTimeWait(current_connection_id));
   }
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net