[PPAPI][MediaStream] Rename AudioFrame to AudioBuffer

ppapi/thunk/ppb_media_stream_audio_track_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_MEDIA_STREAM_AUDIO_TRACK_API_H_
 #define PPAPI_THUNK_PPB_MEDIA_STREAM_AUDIO_TRACK_API_H_
 
 #include "ppapi/c/ppb_media_stream_audio_track.h"
 
 namespace ppapi {
 namespace thunk {
 
 class PPAPI_THUNK_EXPORT PPB_MediaStreamAudioTrack_API {
  public:
   virtual ~PPB_MediaStreamAudioTrack_API() {}
   virtual PP_Var GetId() = 0;
   virtual PP_Bool HasEnded() = 0;
   virtual int32_t Configure(const int32_t attrib_list[],
                             scoped_refptr<ppapi::TrackedCallback> callback) = 0;
   virtual int32_t GetAttrib(PP_MediaStreamAudioTrack_Attrib attrib,
                             int32_t* value) = 0;
-  virtual int32_t GetFrame(PP_Resource* frame,
-                           scoped_refptr<ppapi::TrackedCallback> callback) = 0;
-  virtual int32_t RecycleFrame(PP_Resource frame) = 0;
+  virtual int32_t GetBuffer(PP_Resource* buffer,
+                            scoped_refptr<ppapi::TrackedCallback> callback) = 0;
+  virtual int32_t RecycleBuffer(PP_Resource buffer) = 0;
   virtual void Close() = 0;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_PPB_MEDIA_STREAM_AUDIO_TRACK_API_H_