Simplifying audio network adaptor by moving receiver frame length range to ctor.

webrtc/modules/audio_coding/audio_network_adaptor/controller.cc

 /*
  *  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.
  */
 
 #include "webrtc/modules/audio_coding/audio_network_adaptor/controller.h"
 
 namespace webrtc {
 
 Controller::NetworkMetrics::NetworkMetrics() = default;
 
 Controller::NetworkMetrics::~NetworkMetrics() = default;
 
-Controller::Constraints::Constraints() = default;
-
-Controller::Constraints::~Constraints() = default;
-
-Controller::Constraints::FrameLengthRange::FrameLengthRange(
-    int min_frame_length_ms,
-    int max_frame_length_ms)
-    : min_frame_length_ms(min_frame_length_ms),
-      max_frame_length_ms(max_frame_length_ms) {}
-
-Controller::Constraints::FrameLengthRange::~FrameLengthRange() = default;
-
-void Controller::SetConstraints(const Constraints& constraints) {}
-
 }  // namespace webrtc