PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_tcp_server_socket_private_api.h

Index: ppapi/thunk/ppb_tcp_server_socket_private_api.h
diff --git a/ppapi/thunk/ppb_tcp_server_socket_private_api.h b/ppapi/thunk/ppb_tcp_server_socket_private_api.h
index b88dfc8bb661de214d7ffa519eb64f933cb1af86..e30c0a914cf6d3d8ff2a9bd3f9d5a395a6f12220 100644
--- a/ppapi/thunk/ppb_tcp_server_socket_private_api.h
+++ b/ppapi/thunk/ppb_tcp_server_socket_private_api.h
@@ -6,6 +6,7 @@
 #define PPAPI_THUNK_PPB_TCP_SERVER_SOCKET_PRIVATE_API_H_
 
 #include "ppapi/c/private/ppb_tcp_server_socket_private.h"
+#include "ppapi/shared_impl/api_callback_type.h"
 #include "ppapi/thunk/ppapi_thunk_export.h"
 
 namespace ppapi {
@@ -17,9 +18,9 @@ public:
 
   virtual int32_t Listen(const PP_NetAddress_Private* addr,
                          int32_t backlog,
-                         PP_CompletionCallback callback) = 0;
+                         ApiCallbackType callback) = 0;
   virtual int32_t Accept(PP_Resource* tcp_socket,
-                         PP_CompletionCallback callback) = 0;
+                         ApiCallbackType callback) = 0;
   virtual void StopListening() = 0;
 };