Removing a useless ctor in AudioNetworkAdaptorImpl.

webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.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 14 matching lines @@
 class AudioNetworkAdaptorImpl final : public AudioNetworkAdaptor {
  public:
   struct Config {
     Config();
     ~Config();
     const Clock* clock;
   };
 
   AudioNetworkAdaptorImpl(
       const Config& config,
-      std::unique_ptr<ControllerManager> controller_manager);
-
-  // Dependency injection for testing.
-  AudioNetworkAdaptorImpl(
-      const Config& config,
       std::unique_ptr<ControllerManager> controller_manager,
       std::unique_ptr<DebugDumpWriter> debug_dump_writer = nullptr);
 
   ~AudioNetworkAdaptorImpl() override;
 
   void SetUplinkBandwidth(int uplink_bandwidth_bps) override;
 
   void SetUplinkPacketLossFraction(float uplink_packet_loss_fraction) override;
 
   void SetRtt(int rtt_ms) override;
@@ skipping 17 matching lines @@
   std::unique_ptr<DebugDumpWriter> debug_dump_writer_;
 
   Controller::NetworkMetrics last_metrics_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(AudioNetworkAdaptorImpl);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_AUDIO_NETWORK_ADAPTOR_IMPL_H_