PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_audio_trusted_thunk.cc

 // Copyright (c) 2012 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.
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/trusted/ppb_audio_trusted.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/thunk.h"
 #include "ppapi/thunk/ppb_audio_api.h"
 #include "ppapi/thunk/resource_creation_api.h"
@@ skipping 11 matching lines @@
     return 0;
   return enter.functions()->CreateAudioTrusted(instance_id);
 }
 
 int32_t Open(PP_Resource audio_id,
              PP_Resource config_id,
              PP_CompletionCallback callback) {
   EnterAudio enter(audio_id, callback, true);
   if (enter.failed())
     return enter.retval();
-  return enter.SetResult(enter.object()->OpenTrusted(config_id, callback));
+  return enter.SetResult(enter.object()->OpenTrusted(config_id,
+                                                     enter.callback()));
 }
 
 int32_t GetSyncSocket(PP_Resource audio_id, int* sync_socket) {
   EnterAudio enter(audio_id, true);
   if (enter.failed())
     return enter.retval();
   return enter.object()->GetSyncSocket(sync_socket);
 }
 
 int32_t GetSharedMemory(PP_Resource audio_id,
@@ skipping 13 matching lines @@
 };
 
 }  // namespace
 
 const PPB_AudioTrusted_0_6* GetPPB_AudioTrusted_0_6_Thunk() {
   return &g_ppb_audio_trusted_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi