Remove timing dependent packet checks from socket tests.

webrtc/base/testclient.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 78 matching lines @@
                 const SocketAddress& remote_addr,
                 const PacketTime& packet_time);
   void OnReadyToSend(AsyncPacketSocket* socket);
   bool CheckTimestamp(int64_t packet_timestamp);
 
   CriticalSection crit_;
   AsyncPacketSocket* socket_;
   std::vector<Packet*>* packets_;
   bool ready_to_send_;
   int64_t prev_packet_timestamp_;
-  int64_t prev_time_us_;
   RTC_DISALLOW_COPY_AND_ASSIGN(TestClient);
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_TESTCLIENT_H_