Drop the rtp_rtcp module's dependency on call.

webrtc/modules/rtp_rtcp/include/flexfec_receiver.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.
  */
 
 #ifndef WEBRTC_MODULES_RTP_RTCP_INCLUDE_FLEXFEC_RECEIVER_H_
 #define WEBRTC_MODULES_RTP_RTCP_INCLUDE_FLEXFEC_RECEIVER_H_
 
 #include <memory>
 
 #include "webrtc/base/basictypes.h"
 #include "webrtc/base/sequenced_task_checker.h"
-#include "webrtc/call/call.h"
 #include "webrtc/modules/rtp_rtcp/include/ulpfec_receiver.h"
 #include "webrtc/modules/rtp_rtcp/source/forward_error_correction.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_packet_received.h"
 #include "webrtc/system_wrappers/include/clock.h"
 
 namespace webrtc {
 
 class FlexfecReceiver {
  public:
   FlexfecReceiver(uint32_t ssrc,
@@ skipping 32 matching lines @@
   Clock* const clock_;
   int64_t last_recovered_packet_ms_ GUARDED_BY(sequence_checker_);
   FecPacketCounter packet_counter_ GUARDED_BY(sequence_checker_);
 
   rtc::SequencedTaskChecker sequence_checker_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_FLEXFEC_RECEIVER_H_