PPAPI: Make blocking completion callbacks work.

ppapi/shared_impl/private/ppb_tcp_server_socket_shared.h

Index: ppapi/shared_impl/private/ppb_tcp_server_socket_shared.h
diff --git a/ppapi/shared_impl/private/ppb_tcp_server_socket_shared.h b/ppapi/shared_impl/private/ppb_tcp_server_socket_shared.h
index 6ce8044948b51285b94358c05c6e724cbeed8b13..a8d990071a8ec208ab14512f17c396aa112f19a8 100644
--- a/ppapi/shared_impl/private/ppb_tcp_server_socket_shared.h
+++ b/ppapi/shared_impl/private/ppb_tcp_server_socket_shared.h
@@ -35,9 +35,9 @@ class PPAPI_SHARED_EXPORT PPB_TCPServerSocket_Shared
   // PPB_TCPServerSocket_Private_API implementation.
   virtual int32_t Listen(const PP_NetAddress_Private* addr,
                          int32_t backlog,
-                         PP_CompletionCallback callback) OVERRIDE;
+                         ApiCallbackType callback) OVERRIDE;
   virtual int32_t Accept(PP_Resource* tcp_socket,
-                         PP_CompletionCallback callback) OVERRIDE;
+                         ApiCallbackType callback) OVERRIDE;
   virtual void StopListening() OVERRIDE;
 
   void OnListenCompleted(uint32 socket_id, int32_t status);