[PPAPI][MediaStream] Rename AudioFrame to AudioBuffer

ppapi/thunk/ppb_audio_frame_api.h

-// Copyright 2014 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 PPAPI_THUNK_PPB_AUDIO_FRAME_API_H_
-#define PPAPI_THUNK_PPB_AUDIO_FRAME_API_H_
-
-#include "ppapi/c/ppb_audio_frame.h"
-#include "ppapi/thunk/ppapi_thunk_export.h"
-
-namespace ppapi {
-
-union MediaStreamBuffer;
-
-namespace thunk {
-
-class PPAPI_THUNK_EXPORT PPB_AudioFrame_API {
- public:
-  virtual ~PPB_AudioFrame_API() {}
-  virtual PP_TimeDelta GetTimestamp() = 0;
-  virtual void SetTimestamp(PP_TimeDelta timestamp) = 0;
-  virtual PP_AudioFrame_SampleRate GetSampleRate() = 0;
-  virtual PP_AudioFrame_SampleSize GetSampleSize() = 0;
-  virtual uint32_t GetNumberOfChannels() = 0;
-  virtual uint32_t GetNumberOfSamples() = 0;
-  virtual void* GetDataBuffer() = 0;
-  virtual uint32_t GetDataBufferSize() = 0;
-
-  // Methods used by Pepper internal implementation only.
-  virtual MediaStreamBuffer* GetBuffer() = 0;
-  virtual int32_t GetBufferIndex() = 0;
-  virtual void Invalidate() = 0;
-};
-
-}  // namespace thunk
-}  // namespace ppapi
-
-#endif  // PPAPI_THUNK_PPB_AUDIO_FRAME_API_H_