PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_udp_socket_private_thunk.cc

Index: ppapi/thunk/ppb_udp_socket_private_thunk.cc
diff --git a/ppapi/thunk/ppb_udp_socket_private_thunk.cc b/ppapi/thunk/ppb_udp_socket_private_thunk.cc
index 4f12a3fc5336e66bb250cbd8d25a964c64fb5b9c..f1b07ead60a69962edacd8775e196723f1fe5b60 100644
--- a/ppapi/thunk/ppb_udp_socket_private_thunk.cc
+++ b/ppapi/thunk/ppb_udp_socket_private_thunk.cc
@@ -35,7 +35,7 @@ int32_t Bind(PP_Resource udp_socket,
   EnterUDP enter(udp_socket, callback, true);
   if (enter.failed())
     return enter.retval();
-  return enter.SetResult(enter.object()->Bind(addr, callback));
+  return enter.SetResult(enter.object()->Bind(addr, enter.callback()));
 }
 
 PP_Bool GetBoundAddress(PP_Resource udp_socket,
@@ -53,7 +53,8 @@ int32_t RecvFrom(PP_Resource udp_socket,
   EnterUDP enter(udp_socket, callback, true);
   if (enter.failed())
     return enter.retval();
-  return enter.SetResult(enter.object()->RecvFrom(buffer, num_bytes, callback));
+  return enter.SetResult(enter.object()->RecvFrom(buffer, num_bytes,
+                                                  enter.callback()));
 }
 
 PP_Bool GetRecvFromAddress(PP_Resource udp_socket,
@@ -73,7 +74,7 @@ int32_t SendTo(PP_Resource udp_socket,
   if (enter.failed())
     return enter.retval();
   return enter.SetResult(enter.object()->SendTo(buffer, num_bytes, addr,
-                                                callback));
+                                                enter.callback()));
 }
 
 void Close(PP_Resource udp_socket) {