Only use BBRs pacer if the unit test is running BBR.

webrtc/modules/remote_bitrate_estimator/test/packet_sender.cc

 /*
  *  Copyright (c) 2015 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 141 matching lines @@
 }
 
 uint32_t VideoSender::TargetBitrateKbps() {
   return (source_->bits_per_second() + 500) / 1000;
 }
 
 PacedVideoSender::PacedVideoSender(PacketProcessorListener* listener,
                                    VideoSource* source,
                                    BandwidthEstimatorType estimator)
     : VideoSender(listener, source, estimator),
-      // Ugly hack to use BBR's pacer.
-      // TODO(gnish): Make pacer choice dependant on the algorithm being used.
-      pacer_(new BbrPacedSender(&clock_, this, nullptr)) {
+      pacer_(
+          estimator == kBbrEstimator
+              ? static_cast<Pacer*>(new BbrPacedSender(&clock_, this, nullptr))
+              : static_cast<Pacer*>(new PacedSender(&clock_, this, nullptr))) {
   modules_.push_back(pacer_.get());
   pacer_->SetEstimatedBitrate(source->bits_per_second());
 }
 
 PacedVideoSender::~PacedVideoSender() {
   for (Packet* packet : pacer_queue_)
     delete packet;
   for (Packet* packet : queue_)
     delete packet;
 }
@@ skipping 323 matching lines @@
   RecordBitrate();
 }
 
 uint32_t TcpSender::TargetBitrateKbps() {
   return bitrate_kbps_;
 }
 
 }  // namespace bwe
 }  // namespace testing
 }  // namespace webrtc