PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_audio_api.h

Index: ppapi/thunk/ppb_audio_api.h
diff --git a/ppapi/thunk/ppb_audio_api.h b/ppapi/thunk/ppb_audio_api.h
index 3c9c27415a4d9c2ea7d7a24e6644cb95b8af964e..fb2840575115357b582f7da4390a02b5e327b21e 100644
--- a/ppapi/thunk/ppb_audio_api.h
+++ b/ppapi/thunk/ppb_audio_api.h
@@ -7,6 +7,7 @@
 
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/ppb_audio.h"
+#include "ppapi/shared_impl/api_callback_type.h"
 #include "ppapi/thunk/ppapi_thunk_export.h"
 
 namespace ppapi {
@@ -22,7 +23,7 @@ class PPAPI_THUNK_EXPORT PPB_Audio_API {
 
   // Trusted API.
   virtual int32_t OpenTrusted(PP_Resource config_id,
-                              PP_CompletionCallback create_callback) = 0;
+                              ApiCallbackType create_callback) = 0;
   virtual int32_t GetSyncSocket(int* sync_socket) = 0;
   virtual int32_t GetSharedMemory(int* shm_handle, uint32_t* shm_size) = 0;
 };