[PPAPI][MediaStream] Rename AudioFrame to AudioBuffer

ppapi/thunk/ppb_media_stream_audio_track_api.h

Index: ppapi/thunk/ppb_media_stream_audio_track_api.h
diff --git a/ppapi/thunk/ppb_media_stream_audio_track_api.h b/ppapi/thunk/ppb_media_stream_audio_track_api.h
index e013c4f12351cf610c6782b4ddf75493e770a090..2c43136d32997963ae365a2f3f765e3058b482af 100644
--- a/ppapi/thunk/ppb_media_stream_audio_track_api.h
+++ b/ppapi/thunk/ppb_media_stream_audio_track_api.h
@@ -19,9 +19,9 @@ class PPAPI_THUNK_EXPORT PPB_MediaStreamAudioTrack_API {
                             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;
 };