PPAPI: Make blocking completion callbacks work.

ppapi/shared_impl/private/ppb_tcp_server_socket_shared.cc

Index: ppapi/shared_impl/private/ppb_tcp_server_socket_shared.cc
diff --git a/ppapi/shared_impl/private/ppb_tcp_server_socket_shared.cc b/ppapi/shared_impl/private/ppb_tcp_server_socket_shared.cc
index c919bf29e998b7510985dc22a7c3d38a16811476..eb626fdec4289b74b59ea78b150ebc7b7455b9ab 100644
--- a/ppapi/shared_impl/private/ppb_tcp_server_socket_shared.cc
+++ b/ppapi/shared_impl/private/ppb_tcp_server_socket_shared.cc
@@ -36,28 +36,24 @@ PPB_TCPServerSocket_Shared::AsPPB_TCPServerSocket_Private_API() {
 
 int32_t PPB_TCPServerSocket_Shared::Listen(const PP_NetAddress_Private* addr,
                                            int32_t backlog,
-                                           PP_CompletionCallback callback) {
+                                           ApiCallbackType callback) {
   if (!addr)
     return PP_ERROR_BADARGUMENT;
-  if (!callback.func)
-    return PP_ERROR_BLOCKS_MAIN_THREAD;
   if (state_ != BEFORE_LISTENING)
     return PP_ERROR_FAILED;
   if (TrackedCallback::IsPending(listen_callback_))
     return PP_ERROR_INPROGRESS;  // Can only have one pending request.
 
-  listen_callback_ = new TrackedCallback(this, callback);
+  listen_callback_ = callback;
   // Send the request, the browser will call us back via ListenACK
   SendListen(*addr, backlog);
   return PP_OK_COMPLETIONPENDING;
 }
 
 int32_t PPB_TCPServerSocket_Shared::Accept(PP_Resource* tcp_socket,
-                                           PP_CompletionCallback callback) {
+                                           ApiCallbackType callback) {
   if (!tcp_socket)
     return PP_ERROR_BADARGUMENT;
-  if (!callback.func)
-    return PP_ERROR_BLOCKS_MAIN_THREAD;
 
   if (state_ != LISTENING)
     return PP_ERROR_FAILED;
@@ -65,7 +61,7 @@ int32_t PPB_TCPServerSocket_Shared::Accept(PP_Resource* tcp_socket,
     return PP_ERROR_INPROGRESS;
 
   tcp_socket_buffer_ = tcp_socket;
-  accept_callback_ = new TrackedCallback(this, callback);
+  accept_callback_ = callback;
 
   SendAccept();
   return PP_OK_COMPLETIONPENDING;