[PPAPI][MediaStream] Rename AudioFrame to AudioBuffer

ppapi/shared_impl/media_stream_frame.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_SHARED_IMPL_MEDIA_STREAM_FRAME_H_
-#define PPAPI_SHARED_IMPL_MEDIA_STREAM_FRAME_H_
-
-#include "ppapi/c/ppb_audio_frame.h"
-#include "ppapi/c/ppb_video_frame.h"
-
-namespace ppapi {
-
-union MediaStreamFrame {
-  enum Type {
-    TYPE_UNKNOWN = 0,
-    TYPE_AUDIO = 1,
-    TYPE_VIDEO = 2,
-  };
-
-  struct Header {
-    Type type;
-    uint32_t size;
-  };
-
-  struct Audio {
-    Header header;
-    PP_TimeDelta timestamp;
-    PP_AudioFrame_SampleRate sample_rate;
-    uint32_t number_of_channels;
-    uint32_t number_of_samples;
-    uint32_t data_size;
-    // Uses 8 bytes to make sure the Audio struct has consistent size between
-    // NaCl code and renderer code.
-    uint8_t data[8];
-  };
-
-  struct Video {
-    Header header;
-    PP_TimeDelta timestamp;
-    PP_VideoFrame_Format format;
-    PP_Size size;
-    uint32_t data_size;
-    // Uses 8 bytes to make sure the Video struct has consistent size between
-    // NaCl code and renderer code.
-    uint8_t data[8];
-  };
-
-  // Because these structs are written and read in shared memory, we need
-  // the size and alighment to be consistent between NaCl and its host trusted
-  // platform.
-  PP_COMPILE_ASSERT_SIZE_IN_BYTES(Header, 8);
-  PP_COMPILE_ASSERT_SIZE_IN_BYTES(Audio, 40);
-  PP_COMPILE_ASSERT_SIZE_IN_BYTES(Video, 40);
-
-  Header header;
-  Video video;
-  Audio audio;
-};
-
-}  // namespace ppapi
-
-#endif  // PPAPI_SHARED_IMPL_MEDIA_STREAM_FRAME_H_