Fix Chromium clang plugin warnings

webrtc/common_audio/channel_buffer.cc

 /*
  *  Copyright (c) 2014 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/common_audio/channel_buffer.h"
 
 #include "webrtc/base/checks.h"
 
 namespace webrtc {
 
 IFChannelBuffer::IFChannelBuffer(size_t num_frames,
                                  size_t num_channels,
                                  size_t num_bands)
     : ivalid_(true),
       ibuf_(num_frames, num_channels, num_bands),
       fvalid_(true),
       fbuf_(num_frames, num_channels, num_bands) {}
 
+IFChannelBuffer::~IFChannelBuffer() = default;
+
 ChannelBuffer<int16_t>* IFChannelBuffer::ibuf() {
   RefreshI();
   fvalid_ = false;
   return &ibuf_;
 }
 
 ChannelBuffer<float>* IFChannelBuffer::fbuf() {
   RefreshF();
   ivalid_ = false;
   return &fbuf_;
@@ skipping 33 matching lines @@
     for (size_t i = 0; i < fbuf_.num_channels(); ++i) {
       FloatS16ToS16(float_channels[i],
                     ibuf_.num_frames(),
                     int_channels[i]);
     }
     ivalid_ = true;
   }
 }
 
 }  // namespace webrtc