Simple cleanups of AudioDecoder and AudioEncoder classes

webrtc/modules/audio_coding/codecs/g711/include/audio_encoder_pcm.h

 /*
  *  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.
  */
 
@@ skipping 69 matching lines @@
 
  protected:
   size_t EncodeCall(const int16_t* audio,
                     size_t input_len,
                     uint8_t* encoded) override;
 
   int BytesPerSample() const override;
 
  private:
   static const int kSampleRateHz = 8000;
+  RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderPcmA);
 };
 
 class AudioEncoderPcmU final : public AudioEncoderPcm {
  public:
   struct Config : public AudioEncoderPcm::Config {
     Config() : AudioEncoderPcm::Config(0) {}
   };
 
   explicit AudioEncoderPcmU(const Config& config)
       : AudioEncoderPcm(config, kSampleRateHz) {}
   explicit AudioEncoderPcmU(const CodecInst& codec_inst);
 
  protected:
   size_t EncodeCall(const int16_t* audio,
                     size_t input_len,
                     uint8_t* encoded) override;
 
   int BytesPerSample() const override;
 
  private:
   static const int kSampleRateHz = 8000;
+  RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderPcmU);
 };
 
 }  // namespace webrtc
+
 #endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_G711_INCLUDE_AUDIO_ENCODER_PCM_H_