ditto.
```
if (!sender->Send(new XWalkExtensionServerMsg_RequestSharedMemory(...) {
  NOTREACHED() << "Extension server allocation request message failed";
  return 0;
}

if (!base::SharedMemory::IsHandleValid(shared_mem_handle)) {
  NOTREACHED() << "Extension server failed to request shared memory";
  return 0;
}

shared_buf.reset(new base::SharedMemory(shared_mem_handle, false));
if (!shared_buf->Map(buf_size)) {
  NOTREACHED() << "Map failed";
  return 0;
}
```