Replace AudioDecoderConfig with simple accessors on AudioDecoder.

media/audio/audio_parameters.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_AUDIO_AUDIO_PARAMETERS_H_
 #define MEDIA_AUDIO_AUDIO_PARAMETERS_H_
 
 #include "base/basictypes.h"
-#include "media/base/audio_decoder_config.h"
+#include "media/base/channel_layout.h"
 #include "media/base/media_export.h"
 
 struct MEDIA_EXPORT AudioParameters {
   // Compare is useful when AudioParameters is used as a key in std::map.
   class MEDIA_EXPORT Compare {
    public:
     bool operator()(const AudioParameters& a, const AudioParameters& b) const;
   };
 
   enum Format {
     AUDIO_PCM_LINEAR = 0,     // PCM is 'raw' amplitude samples.
     AUDIO_PCM_LOW_LATENCY,    // Linear PCM, low latency requested.
     AUDIO_MOCK,               // Creates a dummy AudioOutputStream object.
     AUDIO_LAST_FORMAT         // Only used for validation of format.y
   };
 
   // Telephone quality sample rate, mostly for speech-only audio.
   static const uint32 kTelephoneSampleRate = 8000;
   // CD sampling rate is 44.1 KHz or conveniently 2x2x3x3x5x5x7x7.
   static const uint32 kAudioCDSampleRate = 44100;
   // Digital Audio Tape sample rate.
   static const uint32 kAudioDATSampleRate = 48000;
 
   AudioParameters();
-
-  explicit AudioParameters(const media::AudioDecoderConfig& config);
-
   AudioParameters(Format format, ChannelLayout channel_layout, int sample_rate,
                   int bits_per_sample, int samples_per_packet);
 
   // Checks that all values are in the expected range. All limits are specified
   // in media::Limits.
   bool IsValid() const;
 
   // Returns size of audio packets in bytes.
   int GetPacketSize() const;
 
   // Returns the number of bytes representing one second of audio.
   int GetBytesPerSecond() const;
 
   Format format;                 // Format of the stream.
   ChannelLayout channel_layout;  // Order of surround sound channels.
   int sample_rate;               // Sampling frequency/rate.
   int bits_per_sample;           // Number of bits per sample.
   int samples_per_packet;        // Size of a packet in frames.
 
   int channels;                  // Number of channels. Value set based on
                                  // |channel_layout|.
 };
 
 #endif  // MEDIA_AUDIO_AUDIO_PARAMETERS_H_