Remove sequenced task checker from FlexfecSender.

webrtc/modules/rtp_rtcp/include/flexfec_sender.h

 /*
  *  Copyright (c) 2016 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 11 matching lines @@
 #include "webrtc/modules/rtp_rtcp/include/flexfec_sender.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_header_extension.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_packet_to_send.h"
 #include "webrtc/modules/rtp_rtcp/source/ulpfec_generator.h"
 #include "webrtc/system_wrappers/include/clock.h"
 
 namespace webrtc {
 
 class RtpPacketToSend;
 
+// Note that this class is not thread safe, and thus requires external
+// synchronization.
+
 class FlexfecSender {
  public:
   FlexfecSender(int payload_type,
                 uint32_t ssrc,
                 uint32_t protected_media_ssrc,
                 const std::vector<RtpExtension>& rtp_header_extensions,
                 Clock* clock);
   ~FlexfecSender();
 
   uint32_t ssrc() const { return ssrc_; }
@@ skipping 13 matching lines @@
 
   // Returns generated FlexFEC packets.
   std::vector<std::unique_ptr<RtpPacketToSend>> GetFecPackets();
 
   // Returns the overhead, per packet, for FlexFEC.
   size_t MaxPacketOverhead() const;
 
  private:
   // Utility.
   Clock* const clock_;
-  Random random_ GUARDED_BY(sequence_checker_);
-  int64_t last_generated_packet_ms_ GUARDED_BY(sequence_checker_);
-  rtc::SequencedTaskChecker sequence_checker_;
+  Random random_;
+  int64_t last_generated_packet_ms_;
 
   // Config.
   const int payload_type_;
   const uint32_t timestamp_offset_;
   const uint32_t ssrc_;
   const uint32_t protected_media_ssrc_;
   // Sequence number of next packet to generate.
-  uint16_t seq_num_ GUARDED_BY(sequence_checker_);
+  uint16_t seq_num_;
 
   // Implementation.
-  UlpfecGenerator ulpfec_generator_ GUARDED_BY(sequence_checker_);
+  UlpfecGenerator ulpfec_generator_;
   const RtpHeaderExtensionMap rtp_header_extension_map_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_FLEXFEC_SENDER_H_