melt the non-dev audio interface to 0.5

ppapi/c/ppb_audio.h

 /* Copyright (c) 2011 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_C_PPB_AUDIO_H_
 #define PPAPI_C_PPB_AUDIO_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
 
-#define PPB_AUDIO_INTERFACE "PPB_Audio;1.0"
+#define PPB_AUDIO_INTERFACE "PPB_Audio;0.5"
 
 // Callback function type for SetCallback.
 typedef void (*PPB_Audio_Callback)(void* sample_buffer,
                                    size_t buffer_size_in_bytes,
                                    void* user_data);
 
 // Callback-based audio interface. User of audio must set the callback that will
 // be called each time that the buffer needs to be filled.
 //
 // A C++ example:
@@ skipping 39 matching lines @@
   PP_Bool (*StartPlayback)(PP_Resource audio);
 
   // Stop the playback. If playback is already stopped, this is a no-op and
   // returns PP_TRUE. On error, returns PP_FALSE. If a callback is in progress,
   // StopPlayback will block until callback completes.
   PP_Bool (*StopPlayback)(PP_Resource audio);
 };
 
 #endif  /* PPAPI_C_PPB_DEVICE_CONTEXT_AUDIO_H_ */