Revert of Supporting 48kHz PCM file.

webrtc/common_types.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 121 matching lines @@
   virtual ~TraceCallback() {}
   TraceCallback() {}
 };
 
 enum FileFormats {
   kFileFormatWavFile = 1,
   kFileFormatCompressedFile = 2,
   kFileFormatPreencodedFile = 4,
   kFileFormatPcm16kHzFile = 7,
   kFileFormatPcm8kHzFile = 8,
-  kFileFormatPcm32kHzFile = 9,
-  kFileFormatPcm48kHzFile = 10
+  kFileFormatPcm32kHzFile = 9
 };
 
 enum FrameType {
   kEmptyFrame = 0,
   kAudioFrameSpeech = 1,
   kAudioFrameCN = 2,
   kVideoFrameKey = 3,
   kVideoFrameDelta = 4,
 };
 
@@ skipping 682 matching lines @@
 enum class RtcpMode { kOff, kCompound, kReducedSize };
 
 enum NetworkState {
   kNetworkUp,
   kNetworkDown,
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_TYPES_H_