Revert of Supporting 48kHz PCM file.

webrtc/modules/media_file/media_file_utility.h

 /*
  *  Copyright (c) 2012 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 210 matching lines @@
     // Identifiers for preencoded files.
     enum MediaFileUtility_CodecType
     {
         kCodecNoCodec  = 0,
         kCodecIsac,
         kCodecIsacSwb,
         kCodecIsacLc,
         kCodecL16_8Khz,
         kCodecL16_16kHz,
         kCodecL16_32Khz,
-        kCodecL16_48Khz,
         kCodecPcmu,
         kCodecPcma,
         kCodecIlbc20Ms,
         kCodecIlbc30Ms,
         kCodecG722,
         kCodecG722_1_32Kbps,
         kCodecG722_1_24Kbps,
         kCodecG722_1_16Kbps,
         kCodecG722_1c_48,
         kCodecG722_1c_32,
@@ skipping 32 matching lines @@
 
     // Only reading or writing can be enabled, not both.
     bool _reading;
     bool _writing;
 
     // Scratch buffer used for turning stereo audio to mono.
     uint8_t _tempData[WAV_MAX_BUFFER_SIZE];
 };
 }  // namespace webrtc
 #endif // WEBRTC_MODULES_MEDIA_FILE_MEDIA_FILE_UTILITY_H_